Should I be mad?

Okay, so here's the situation. My boyfriend (we've been together for almost three months) let his ex & her new boyfriend stay at his place for a while until they can find a place of their own, (they moved back to Maine from New York). He gave them a deadline, July 20, today, & they were supposed to be out, whatever. Whenever I'm there, the ex, we'll call her N+ doesn't look or talk to me (she's jealous because my boyfriend[C] grew up & realized how to treat a girl right). C gave N+ & her boyfriend (N) his room because N+ is pregnant. Well now, I planned on leaving some stuff at his place & cooking him dinner & having a fantastic weekend with him. But now I don't know if I want to go over there. The last time I went over, I stayed upstairs & N+ & N fought and it was bad.. I don't want to feel awkward or out of place at his house.... he's sorry that they're still there & told me to brain storm ideas on how to get them out... what should I do....?