What should I do when my boyfriend is a bar star??

My boyfriend is a barstar and I need some advice

Im not a fan of his behaviour and dont know what to do. We have been dating for almost 4 months. He goes out almost every weekend to the bar and almost always gets drunk, passes out at home and wakes up with a hangover. He’s 25 and he still does this.

Sometimes he’ll take me along and other times he just goes with his guy friends.

I guess what really bugs me is:

1. He says he goes out to have drinks, get out of the house with his friends and ‘people watch’. Why not do that at a pub instead of a bar with tons of women?

2. I know that girls approach him because I have seen it/heard it from him. Im trying to trust him but I get annoyed when I see/hear of girls doing this.

My friends laugh at me because of my bar star boyfriend and I dont know what to do! Please help!!