I've been with my fiancee for 5 years now, 6 in June. We've been living together for 3 years now since my daughter was born.
We used to party before and hang out with friends. But after I got pregnant with my daughter I gave him the choice to either drop the lifestyle he was living and be a family and MOVE FORWARD or leave me alone so I could do the proper thing and GROW UP!
We are getting married in May and he does not go out drinking ever at all. We go out and have an occasional cocktail but he never is out with his friends any more ever.
If he can't give it up for you then he's not worth it!