My best friend (boy) just came out to me that he is gay (I'm a girl).

I have been in love with him for 2 years now, and I am utterly devastated by this. I am really, really heartbroken. This happened just 3 days ago and I'm still in a state of shock. I don't know what to do now. I tell myself I'm feeling sad because I thought I might lose him, because he is now this new person I never knew, because he was never the guy I thought he was. But honestly, it may be because I am losing him as in I can never be his girlfriend/wife (because he will never like girls!). How do I deal with this?