i have a girlfriend and dont get me wrong i like her and dont want to hurt her but i met this girl in college and we have become like best friend and i think im in love with her but i never got the courage to tell her now she has a boyfriend and i dont know what to do?
You couldn't have done anything to begin with since ou have a girlfriend. Right now there's literally nothing you can do because you're both taken (by the way if you don't want to heart your girlfriend you should just break up with her, it isn't fair on her if you're going round chasing other girls).
Dump your current girlfriend since you don't even appear to love her. As for the girl you're 'in love with', forget about her and move on. She's with someone else now and there's nothing you can do about it. You don't deserve either of them since you willfully got to know another girl emotionally whilst you had a girlfriend.