<human>: Can you condense the text into a few key points?

I have a friend. Let's call him Sam. There is history between us, he asked me out but I didn't reciprocate his feelings. About 4 months afterward, when I was away, he got a girlfriend. She is a nice girl, I mean genuinely not fake, and she's a little shy. I figured he was over me so I mentioned that I had feelings for one of his friends. Well he may not have been as over me as I thought, because he vented to his friends about it. Not the one I liked, but of course he found out. He distanced himself, predictably enough, and I backed down. 

Whenever we meet he brings his girlfriend as a matter of course, and usually there are ~4/5 people in the joint. He and I are both big talkers so we talk the place down and we can stay up till the early morning just chatting. I try to include his gf in these conversations but she's awkward so while she thinks of a response he usually jumps in with his opinion. He also reminds her of a "big" (not really) favor I did her back before they got together. He says that every time he sees us together he thinks of it. That may be true but I worry that he's being insensitive and putting me on some kind of pedestal.

His gf invited me to his birthday (see: genuinely nice) but I don't really like crowds and I didn't want things to be awkward, so I decided not to go. We haven't talked for a few weeks and I'm thinking maybe it's better not to be friends. Or am I overthinking my role in this? Maybe I'm being arrogant by assuming I have any effect on their relationship? Because I would totally love it if that's the case, I could just not worry and hang out like old times.
<bot>: My friend talks to me a bit too much when we hang out and used to like me. I don't want to make things awkward.