I would just back off for now. It is hard, and I can so empathize with you. But remember, baby steps. For now, just continue to view him as a friend. It seems like you have having a peaceful co-existence. I know this sitch must be tearing you up inside, but remember, think "what is my goal here?" And then act accordingly. Don't panic, and if you do feel yourself panicking, take yourself out of the present sitch and breath.
Im still standin better than I ever did looking like a true survivor feeling like a little kid Im still standin after all this time and Im picking up the pieces of my life without you on my mind..