Well first you have to figure out what YOU want. Do you want your crazy g/f who gets drunk and acts a fool, or do you want this girl you had a crush on before who says she's horny and asks if you know any guy that can put his cork in her hole.

Neither sound all that appetizing to me, personally. But once you decide which you want to pursue, you can act on it. If it's your g/f, you need to let her know that kind of shit is not cool at all. If she wants to be with you, she has to control herself and her drinking. If you want to be with the other girl - you have to break up with your g/f and go from there.