I think the change in Matt is coming partly from Heidi being gone but also because like anyone else he can only hold back for so long. He had the initial excitement of the house and Caleb to keep him entertained and then last week was the battle of the bands schtick. Now that it's fairly quiet he has more time to think about/get pissed off about things.
It's going to be very interesting to see what happens with Matt if Ed goes as it seems he will this week. He'll be the last one left of the boy posse so I'm curious to see if he attempts to get closer to anyone else of if he just lone ranger's it until he's inevitably gone in the next week or two. If he starts to openly speak his mind more about Drully and picks well with his next buddy ie Tim or Jade then he might last a bit longer than he would've otherwise.
It's going to be very interesting to see what happens with Matt if Ed goes as it seems he will this week. He'll be the last one left of the boy posse so I'm curious to see if he attempts to get closer to anyone else of if he just lone ranger's it until he's inevitably gone in the next week or two. If he starts to openly speak his mind more about Drully and picks well with his next buddy ie Tim or Jade then he might last a bit longer than he would've otherwise.