<human>: He has a regular group of friends that he sees (a mix of guys and girls). I know that at least 3 of them are in relationships and all their partners have become part of the group.

I feel confused as to why I haven't been included. Is it because it's too early to meet his friends? I know that having time away from each other is a good thing but I think it's just the fact that other partners have been included so I feel a bit down about it. His friends drink a lot too and I don't really... Could that be another reason? That he just wants to let loose without having to worry about me? But then again, I think it's a pretty stupid reason not to include someone because of their drinking habits...

I think the fact that I don't have many friends is also a factor in how I'm feeling. I almost feel stupid/embarrassed because his friends have their boyfriend/girlfriend there while I'm by myself...

Apart from this, he is a caring and loving boyfriend but it's just this one thing that's been stuck in my mind and I can't help but feel like I've been kept separate from another part of his life...

Could someone provide some insight? If your partner doesn't hang out with you and your friends, why is that?

Can you give me a shortened version of the text?
<bot>: Never been invited to hang out with boyfriend's mixed group of male and female friends, even though his friends' partners are always included. Can someone provide some insight?