There was the implication that his mother is a succubus

http://www.youtube.com/watch?v=c_NFLs3f914

And I'm not a big fan of Matt because I feel like inserting him into Tyler and Caroline's much more interesting storyline just dragged it all down to the level of a triangle that they didn't really need, just to give Matt something to do. I feel like I should like Matt because he has had a tragic life, and his motivations do make sense, but honestly I'm really not a fan of the actors line readings, so I've not been able to sympathize with him much