Details: They started dating after Peyton's split from Lucas Scott. And eventually moved in together and as Peyton described it "fell in love". But Julian soon realized Peyton still had strong feelings for Lucas and ended their relationship, leaving them both devastated.
Details: After Julian worked on Lucas movie the two became close after working together and started to date although Brooke being unable to say I love you to Julian caused them to split until she flew to New York to tell him they continued their relationship for over a year before Julian moved in after finishing his most recent movie. But while in Tree Hill he started work on a movie with Alex Dupre who set her sights on Julian causing as well as Brooke being unable to have kids to spilt. But they quickly recoiled and got engaged. They later married after Brooke problems with Julian's mother, Sylvia. Eventually Brooke fall pregnant and gave birth to twin boys Jude and Davis Baker.
Details: After Alex arrived in Tree Hill, she immediately made her attraction to Julian known despite him being with Brooke at the time. Their often flirtatious relationship was intensified when Julian started working closely with Alex on a script which Alex wrote. Their working relationship was often complicated by Alex's behavior around him, such as undressing for him to prove the realism of a scene she wrote, and it affected Brooke greatly who refused to trust Alex around her boyfriend. However, when the script was finished Alex worried that she would lose contact with Julian and sought ways to stay in his life. Julian confronted her and told her that he didn't love her, he didn't even like her leading a devsatated Alex to try and kill herself. After finding her, Julian promised to stay with her during her rehabiliation after finding out their movie would be made, in order to try and save her.