Oh my gosh, what kind of guy is this? Who doesn't flush?And who is so non-tactful to say things like that in front of your poor roomate's new bf? I would be so emberrased, not only for you, but for your roomate with the jerk boyfriend. Does she not acknowledge how he acts? Or does she just make excuses for him? I would definately sit down with all your roomies, and tell GWJB( girl w/ jerk boyfriend) that while you know she puts in her share around the apartment, her bf doesn't and you don't appreciate his behavior. Or his sponging. You live there too, and you shouldn't have to put up with it. I'd say things like.."gosh, I never see you on the weekends anymore, it would be so nice if it was just us girls this weekend" Or something like that. I don't know-I would probably lose my temper and yell at both of them.
Probably not a great idea.
When my boyfriend and his frat brother lived together, they had a rule, that I still use today-you get one cup per day. None of that drinking from one cup, and getting another stuff. That way, you only have a couple of cups sitting around-as opposed to 7. That rule even applied to us girlfriends. It really cut down on the dishes laying around, you know?