What Should I Do? Options

[Celica_Fan]

There is a girl I really like I have known her for awhile we talk on the phone, chat on msn and txt each other. We talk for hours on msn and she seems to get jealous when I say I like brunettes coz she's blonde I really don't mind either blondes or brunettes. The other day some w**nker that hasn't seen her for about 6 months sees her again and says he likes her and he came and saw her and he got really drunk. He seems like a complete arsehole she says lots of her guy friends like her it's pissing me off coz I like her alot not faking this bs like they seem to be. She's going to this guys house he seems like he just wants sex from her and to get really drunk she is my friend as well. It's pissing me off I feel if I see that guy he will get a black eye or a broken nose and she calls him her friend what should I do??? I think she knows I like her but i'm not sure.