Board Thread:False Info and Speculative Discussion/@comment-24601009-20140331033031/@comment-24747729-20140331174009

Well, as Melissa stated, she kicked a drunk out of the house. She didn't kick a father out of a son's life.

I think she still has some feelings for him. This would explain why she hadn't changed the locks. She was hoping he'd come back. Hell, it seems like she hadn't even dated anyone else in the meantime until Peter came along. Perhaps she finally reached a point where she acknowledged that he wasn't coming back and felt it was okay to date. Of course, that date happened to be with a psychotic Alpha werewolf with a blood vendetta who only wanted to use her to get to Scott, and said date was ruined (thankfully) by Stiles, but whatever.