In his responses to reviews and in the forum Mark gives us some of his insight into his character Matt. While everyone reacts individually to grief, Mark has indicated that Matt was particularly affected by Robbie's death and was having a hard time. He also said that Matt is clinging to his last year as an undergrad in an almost sophomoric way. In another place he stated that Matt wasn't as screwed up as Robbie was in college and that would be hard to argue. My point is, that Matt has been coming across as a bit of a shit lately, especially toward Wade who truly has his own crosses to bear. That he also pointedly crossed the line with Tony despite Will's strong advice not to had to be somewhat calculated and not just a loss of hormonal control. Finally, the chapter ended with Matt pissed off and going to see JP & Steff in mood not conducive to reason and I expect fireworks. A controlled display from JP and Steff and an uncontrolled one from Matt. My fear is that Matt could cross the line with JP and Steff and find himself in a really bad place.
Hopefully Mark has a solution for what I fear could be some really rough going for Matt.