Anybody but Justin
This was just "eh". I didn't understand how they could be roommates for two years while she worked at a place that deals with abused women and him have no clue about her big secret. The conflict at the end that caused Gabby to run out didn't really make sense, either - why would he leave something like that up on his screen with the excuse that he was trying to figure out how to reply to it when they'd had sex the night before and she'd spent the night at his place. Also, the IM was out of place, too, if he'd abstained for 6 months.