So I live with one of my old friends, and we usually go out together. I have made an active effort to meet new people since we both moved here two years ago, so I usually am the one who introduces girls to him. He is pretty game unaware, and is just not a great team player in general. That's fine, I've tried to explain things to him but he isn't one to take my advice on things of this nature.

My main problem is that whenever I have something going with a girl (ie we've been flirting or have hooked up) he, not knowing many other girls, spends the entire night relentlessly hitting on that girl. He will buy her drinks and never leave her side. I'm not necessarily a jealous person when it comes to girls and other guys, but when my guy friends try to hook up with girls that I have been with, or whom they know I'm trying to hook up with, I get really pissed off. My entire friend group has operated like this for years, with one guy bringing a girl and everyone spending the entire night hitting on her, and I have always thought it was stupid (Not until becoming game-aware did I realize how detrimental it was to all of us in general). I really have never done this because of a guilty conscience or maybe just that I'm not willing to strain friendships in exchange for a possible hookup. One time my roommate's ex-gf, came onto me really strong while they weren't dating and I shut her down because I'm not an asshole.

Basically, it's not that he steals girls away from me, but I feel like it just ruins a lot of nights for me because I end up getting really annoyed with what's going on, and it keeps me from being able to escalate things with him around. I confronted him one night when he and the girl i had been banging walked out of the bar while I was in the bathroom, and I caught up to them holding hands, and confronted them. He just played dumb and said they were only holding hands. Later he just said that the girl had said that she and I were done (bc I wouldn't date her), as though that were justification for his behavior. Anyway, my question is whether I'm being a little bitch with jealousy issues or if I need to just stop going out with my friend (difficult, since we live together)? Should I just look at this as an opportunity to hone my game? I know this wasn't brief, but I wanted to explain things. What would yall do?