How many times you will hear this in your lifetime. Chalk this up as number one, there will be more. I guarantee it. It's hard to let go but if he cares for you at all he will come around. It's nearly impossible to be just friends after you have slept with him but it can be done. Just avoid any physical contact at all. Smile a lot and pretend he is your brother or a cousin and see what. if anything, happens. Give it time girl.