[user104658]

People have really selective hearing sometimes... He said several times (every day!) To Hazel and others, that his girlfriend had basically broken up with him or put them "on a break" before he went into the house. "She said we're not together, you go in there and do whatever and we'll see what happens when you get out" is along the lines of what he told both Hazel and Dexter in several conversations.

Apparently this was a lie, but was Hazel supposed to somehow know that? Why wouldn't she just accept what he was saying as true? It's hardly the first time someone has lied about their relationship status to get a bit of touchy:feely with someone else but it makes him the arsehole, not her.