Doesn't sound like a good situation....

Maybe you should call a house meeting and just vent, possibly they think you're doing it cause you want to, and don't realise what's going on? Or maybe look for a new place? Or just refuse to do it anymore until they pitch in?

If that's too much, maybe talk to your bf before he goes, and get him to confront the others with you.... it doesn't have to be angry...