It's really difficult when your crush dates someone that's close to you, but maybe you could tell your friend how you feel...? I've said it to people before, but it's ok to fancy someone with a girlfriend as long as you don't show it too much...! Maybe if they're going out, you'll have more of a chance of talking to him, then if they ever do split up, he may need you....? Just try not to show you're upset, but if you do tell your friend, she may understand! Good luck :) x
i noe its stupid to post that quote but i was just annoyed and needed 2 blow some steam. sry!