Damn
Good for him. You can just be friends as before. As long as you don't stay over with him it's okay 

As long as it he doesn't develop feelings for you nothings really gonna happen. 

He wants your cock.
It changes nothing 

hacked .
Just be honest with him and say you have feelings for him.
Well you could be the good friend and support him of his actions or you can be the bad friend and ignore him and don't help him.
