Kissed Hope Logan knowing she was engaged to Liam Spencer 
Stole the Hope for the Future Diamond, then planted it on actual jewel thieves to impress Hope 
Punched Liam Spencer 
Romanced Nicole Avant to get incriminating information about Rick Forrester 
Slept next to Steffy Forrester despite her being engaged to Liam 
Wyatt Fuller is the son of jewelry designer Quinn Fuller and Bill Spencer, Jr., with whom Quinn had a long-ago affair; Wyatt grew up believing his father was dead. Wyatt met Hope Logan when she photographed him taking a solar shower at his campground in Big Bear, California; Wyatt impulsively kissed Hope, who had run away and knocked herself unconscious. Though Hope lamented the absence of her on-again-off-again paramour, Liam Spencer, who was working through being deserted by his wife, Steffy Forrester, Wyatt introduced Hope to Quinn, unprepared for the shock when Hope figured out that Bill was Wyatt's father by matching up the identical sword necklaces they wore. Wyatt felt betrayed by Quinn and was furious with Bill for having given his mother money for an abortion.
Wyatt briefly entertained taking both Hope and Spencer Publications from Liam, but soon he focused solely on Hope; Wyatt kissed Hope, earning Liam's fist in his face. Wyatt thrilled when Hope decided to incorporate Quinn's accessories into Hope's Hope for the Future (HFTF) fashion line at Forrester Creations, and gladly followed Quinn's order to take Hope to Mexico to secure a rare diamond. Surprised when Quinn sent Hope a video tribute Liam made for Steffy, Wyatt used the resulting rift to propose to Hope himself, then pocketed the diamond and placed it on actual jewel thieves he pretended to retrieve it from.
Wyatt dated Hope after she dumped Liam for having a secret meeting with Steffy on their wedding day. Wyatt made love to Hope for the first time on a beach camping trip, his reverie broken when Liam arrived with security footage of Wyatt "stealing" the diamond. Wyatt was dismayed when Hope left him standing on the beach, but later, after Hope took him back, Wyatt's theft was buried by Forrester Creations to prevent a media scandal.
Wyatt wanted to honor late Forrester matriarch Stephanie Forrester by tying her personal jewelry into HFTF, but Stephanie's granddaughter, Aly Forrester, who had a history of mental illness stemming from the violent childhood death of her mother, loudly objected. Wyatt dismissed Aly's contention he was corrupting the message of purity Hope had layered into HFTF and was slapped by Aly for bragging he'd slept with Hope; Wyatt worried when Aly caught him in bed with Hope and threw a tantrum.
Wyatt was disappointed when Hope's pregnancy scare was only that, but more so when Hope agreed to date both Spencer brothers. Wyatt lost Hope when he punched Liam for going off on Quinn, whose attempts to come between Bill and Brooke Logan, Hope's mother, ended with Brooke's ex-husband, Ridge Forrester, falling from a helicopter in Abu Dhabi and sustaining brain damage. Hearing that Quinn had been tormenting Liam to keep him away from Hope, Wyatt barely stopped Quinn from impaling Liam with a sword. Wyatt and Liam bonded over the ordeal, and later Wyatt received a text from Quinn in which she said she had checked into a psychiatric hospital.
Wyatt inherited the HFTF diamond from its owner, Ricardo Montemayor, and publicly presented it to Hope. But when a detective told Wyatt that Ricardo had been murdered, Wyatt briefly wondered if Quinn had been responsible. Wyatt flew to Paris with Hope, who had told Liam to meet her at the Eiffel Tower to get married. When Liam didn't show, Wyatt convinced Hope to marry him in Monte Carlo instead. Wyatt was sure Hope would leave him when they found out Liam was late was because Quinn had pushed fellow jewelry designer Ivy Forrester into the River Seine; instead, Wyatt got news that Hope was carrying his baby.
Wyatt grudgingly considered getting a restraining order against Quinn, who kept insinuating herself into the pregnant Hope's life; when Hope fell down a flight of stairs and lost their baby after arguing with Quinn, Wyatt sadly watched as Hope went on an extended trip to Milan, Italy. Wyatt followed to plead his case, but came back with a divorce. Wyatt frowned on Quinn's relationship with Hope's father, Deacon Sharpe, knowing Deacon still had a thing for Brooke, and went straight to Quinn after hearing Deacon tell Brooke he'd reunite with her if he and Quinn weren't engaged. After Quinn and Deacon worked things out, Wyatt was the only guest at their wedding except for Hope, who chimed in via video call in an unsuccessful attempt to stop the ceremony.
Wyatt teamed up with Liam to force tyrannical Rick Forrester out of Forrester's CEO chair. Sensing a secret surrounding Rick's mistress, Maya Avant, Wyatt romanced Maya's inexperienced little sister, Nicole Avant, for information. Wyatt genuinely liked Nicole, but worked on her until she admitted Maya was transgender. As Wyatt and Liam deliberated over what to do with the revelation, publishing magnate Bill splashed it across his media platforms; Wyatt understood when Nicole declared she'd never trust him again.
Wyatt took an interest in Steffy and kissed her despite her desire to reunite with Liam; eventually Wyatt began dating Ivy. After the increasingly unstable Aly regressed and died confronting Steffy, Wyatt incredulously viewed a video Ivy shot that seemed to show Steffy killing Aly with a tire iron. Feeling marginalized by their families, Wyatt supported Ivy using her video to blackmail a modeling gig out of Steffy; later, Wyatt thought better of it and helped persuade Ivy to delete the incriminating footage. After Steffy fired Ivy and forced her to model lingerie, Wyatt went to Bill with a request to bankroll a new fashion house and was angry when Bill declined.
Wyatt resented Steffy's brother, Thomas Forrester, flirting with Ivy and refused to believe Steffy's claim that Ivy had kissed Thomas. Wyatt walked out when Ivy confirmed it but rushed to her side when she was electrocuted following a scuffle with Steffy. Wyatt talked Ivy out of having Steffy arrested for violating her restraining order, then bought a ring for Ivy. But Wyatt's proposal was interrupted by Quinn, who overheard Ivy telling Liam she wanted him back. Wyatt sent Ivy packing and cuddled Steffy in bed while Liam escorted Ivy back to Australia.
After Liam sent Steffy text messages ending their relationship, Wyatt wanted Steffy to move on with him and kissed her again, soon asking her to marry him. Wyatt couldn't believe his good fortune as he exchanged vows with Steffy on the beach and began training under a much more accepting Bill, but Wyatt was torn when he saw Forrester security footage that showed Quinn driving off with Liam after he fainted and hit his head in the parking lot. Wyatt went to see Quinn at her cabin and found her kissing an amnesiac Liam, who had been told Quinn was his wife; when Liam had total recall, Wyatt helped his brother lock Quinn in a closet and brought him to a worried Steffy. Wyatt felt for Liam when he had to be told Wyatt and Steffy were married, but Wyatt was back sparring with Liam when Liam declared he wanted Steffy back.
After Liam's lawyer discouraged him from pressing charges against Quinn, Wyatt was shocked to learn that Liam's home intruder was Reverend Rydell, who officiated at Wyatt's wedding. Wyatt breathed a sigh of relief when his marriage turned out to be valid and turned his attention toward making Steffy the face of Spencer Publications' social media. To that end, Wyatt paraded Steffy around the Spencer Summit in Monte Carlo, promising Steffy he'd keep Quinn away from her, but Wyatt soon learned that Quinn had gotten involved with Steffy's grandfather, Eric Forrester. Wyatt told Quinn not to accept Eric's invitations to return to Forrester and move into the mansion, but Wyatt couldn't keep Steffy from bunking with Thomas when his efforts were for naught.