I have and it is horrible!
I fell for my gay friend. We spend a lot of time talking to each other and are close. He's gay. He's not even my type but there's something about him that I can't pinpoint. I have got mostly over myself and my feelings aren't as strong. At one point I ended up crying about my feelings for him, they were that strong. I've never told him how I feel and never will. There's little point in doing so.
Anyone else had the pain of unrequited love?