It is her fault, and her reality show proved it. When they got married she wasn't willing to move in with him knowing he's on the basketball team there. He moved and got traded so he could be with her. All of a sudden she comes up with the "We should have a baby" idea, but he's against it. However after her friends and family says it's a bad idea, she says he came up with it and she didn't like it. Before it ended she emotionally pushed him away, so he started hanging out with his friends. At this point she starts telling everyone she made a mistake and putting it all on him. We all know what happens after that.
(That was my second time watching an entire season of the show, because I knew the cameras would show the truth.)