I can understand your situation, as I'm often in something similar (I don't have a boyfriend now, but it did apply when I did have one). I'm the person who's not comfortable being around friends of my friend that I'm not friends with. I try but there's just some kind of a mental block that keeps me from really being able to connect with them.

That being said, there's something to be said for habits, especially since Aspies are creatures of habit. I've trained myself ("Hi, how are you?" "I'm doing well. How are you?" "I'm good." "Good!" *smiles and hopes it doesn't look condescending*) so I can generally get along with people in these situations but it's still very difficult unless I find myself one-on-one with them.