Liam never revealed who he slept with, leading everyone to believe he was deceiving Annie. To retaliate against Naomi, Annie said that she and Liam had slept together. This led to a fight between the two women where they both stated their reasons for wanting Liam to be single.
Liam decided to end his marriage to Annie, leaving her heartbroken. He then began dating Naomi, which didn't sit well with Annie. She tried everything she could think of to win Liam back but all her efforts were in vain. In the season three finale, it is revealed that Liam has been sleeping with Annie all along. Hurt by this revelation, Naomi leaves Los Angeles for San Francisco without him. The next day, at a wedding ceremony where Liam is supposed to marry Annie, he tells her that he doesn't love her anymore. This sends Annie into a deep depression and she decides to move to New York City to start over.
Liam then makes plans to leave California too and go live with Annie in New York. Just as he's about to board his flight, he gets a phone call from an unknown number and it turns out to be Annie. She tells him that she has changed her mind and wants to stay married to him.
Liam proposed to Annie twice during the fourth season. Although she declined his proposal each times, she did so because she suspected he was going through something he wasn't telling her about. They both dated other individuals, but it was evident throughout the season that they still had affections for one another.
She first heard about what would become of him when Silver left him a voice mail saying that she found "a better guy." She then saw him at the hospital where she works as a nurse and asked him why he didn't tell her anything about himself. He told her that he was trying to protect her by not revealing his true identity and said that they should leave things on a positive note by going out for drinks. However, at the end of the night, she realized he hadn't changed and walked away from him. Later that evening, after hearing that Trista had been killed, she called Liam and told him that she needed time to process what happened and that she wouldn't be able to go out with him again.
Six months later, after graduating from UCLA, he returned to Los Angeles hoping that she would change her mind about marrying him. When that didn't work, he decided to move forward with the wedding planning anyway. At the wedding ceremony, however, she stood up and told everyone that she was sorry for thinking that Liam was someone else and that she loved him only he couldn't hear her because he was off speaking at some conference.
Liam has been interested in Annie since he met her in the first season, and in the second season, they begin to become closer. Annie was there for him when he needed someone to talk to, and they began to share secrets. At the start of Season 3, Liam is furious at Annie for not returning his calls all summer, and Annie apologizes. However, things aren't quite back to normal between them.
Liam wants to go to Columbia University in New York City, but his grades don't qualify him for any college scholarships so he decides to apply for work permits. One day, while walking home from school through a park, Liam sees Annie being attacked by some boys. Without thinking, he pulls out a knife and attacks the boys, injuring one of them. The police arrive and arrest Liam for attempted murder. When Annie finds out about this, she's furious with Liam for what he did. However, after talking with the lawyer who represents the injured boy, Liam realizes that if he went to trial for the attack, he wouldn't be able to get out of it. So instead, he agrees to do community service and attend school on Saturdays.
Liam learns that doing good deeds will never erase his crime, but he hopes it will help him get into Columbia. After graduating high school, he gets a job as an assistant editor at a publishing company. He also starts going to classes at Columbia University during the weekdays.
"Yes, friends, Liam and Annie are finally engaged after five seasons and way too many needless barriers!" they wrote. Everyone in Beverly Hills is happy today, except Silver, who didn't get the happy ending he deserved. "She is still suffering from cancer."
Annie has been through a lot over the years, including losing her mother when she was just 10 years old. She works as a social worker to provide for her brother and sister so they don't have to suffer like she did. She's also very close with her father, who recently died.
In addition to helping others, Annie loves animals and is a staunch vegan. She also has a kind heart even though she had such a terrible childhood.
It's clear that Liam cares about Annie a lot because she has been his priority since he got back from Afghanistan. They've shared their feelings for each other but were always stopped by some sort of obstacle.
Annie first came into town where Liam lived with his dad. At the time, he was dating Taylor, who used her celebrity status to take advantage of him. When Liam found out, he dumped her without explanation. After that, he decided to move home to care for his sick father. He knew it would be hard without a job or any money, but he wanted to be near his family.