there are technically two things that you can do. Wait or move one..When you are prepared to wait also take into account that it will kill you slowly and painfully because seeing him with someone else will make your heart drop and break to many pieces... basically the song More than this by One Direction will describe your life (sorry if you dont like them, but its a good song)... then one day you never know they might break up and you could be there to help him out and maybe he will see you as a gf material... however there is no way of telling if the break up will happen and DONT try to break them up because you will make things worse than they are......If you move on, it will be hard at the begining and you will struggle but once you are moved on it will make you happy and basically you will feel freeepersonally i would go with move on, you will live in regret and hope... but it will only be temporary
theres nothing you can do to help :/ sorry to have to tell you that. all there is is just moving on and letting it go. if i were you i would just focus on something else (for me it would be art) or anything your interested in, focus on being a good friend for him. if he comes to you for relationship advice, put the relationship hes in before how you feel. just be a good person for him and focus on other things than how you feel about him.
I was in your same situation, I fell in love with a friend of mine and he had a girlfriend that loved so much. At first, I didn't want to make a move or something, I knew that there were no possibilities for me, it would have been awkward if I confessed, so I just remained quite watching him from afar. But after a few months I developed a stronger feeling for him, but I didn't want to ruin our friendship, nor to couse any problems to his relationship. I admit it that when I discovered that he was in bad terms with his girlfriend, it was like seeing a light of hope for me, but then I saw him struggling like a dog for her, so I decided to give up and move forward to another guy. The worst thing about having a crush with someone who is already in a relationship, is being friend with this person, and I just thought that hurt myself for him was unnecessary. Take your time, but move forward, because no one will wait for you.
It's a trap! For the love of all that is holy or unholy or even remotely capable of helping a being see reason, don't do it!! The friend zone is a terrible, evil place to be. I say this from sad and pathetic experience. I have issues in relationships in that I don't start to feel attracted to people until I know them well enough to trust them. Usually by then, we are friends. I have been pining after this damn guy for a year and a half! He doesn't even have a bloody girlfriend anymore and worse, he knows I like him and still talks about girls and how bad he needs to find a new relationship to me!! I should beat his stupid mildly attractive but lopsided face! Ahhh! But the rant aside, it's not worth it if you can avoid it. It makes dating hard because you still have hope if you are waiting for them. Let it go while you can. I'm still waiting for this bloody pain to PCS next year so I can get over him. Ugh!