ADVICE PLEASE!

Mary Grace
Me and one of my close friend likes the same guy. He knows she likes him but doesn't know I like him. He likes us both but he wouldn't date her but would date me. She doesn't know I like him and I've tried to hint at it for awhile. Shes told me if I go out with him or even like him we won't be friends anymore and were really good friends. I don't want to lose her. What do I do?!?