Unrequited love

I like a guy in my choir. Him and I are acquaintances. He goes to the pub, like I do. I see him often. I like him a lot. He doesn't know, but I do know he likes someone else from this support group for stuttering he goes to....and another person in choir has also pointed out he may like one of my friends, which I have also noticed, when he failed to say goodbye to me and instead said ''Don't forget to take your Christmas hat off'' (it was the choir Xmas meal.) He was too busy talking to her. What do I do. I need to get over him, I'm so heartbroken right now.