At the beginning of season 5, Sam and Addison are back together, although they break up again as he is still not ready to commit to marriage and a family with her. ... Although Addison still has feelings for Sam, she also has feelings for Jake, the latter of whom wants to get married and have kids.

Why did Addison and Sam break up?

They embarked on a relationship after Addison had lived in L.A. for some time. Their on-off relationship was marred by trouble and eventually ended due to Sam's unwillingness to have any more children.

Does Sam cheat on Addison?

Addison is in her therapist's office. She says Sam cheated on her. It makes her feel free. Sam did a terrible thing, but she still loves him.