I just recently went through this myself. Just friends but felt like they were almost playing out a fantasy about our being together. It escalated to the point I felt I had to move. I did move and he became angry. It is/was a situation where the friendship only increased the desire to have more than what I had to offer. I am happily married and he knew that - I feel there was always hope in there that someday my marriage would end up like many others out there, and he'd be there when this happens.
It's most likely you won't be able to have the kind of relationship with your friend that you're hoping for. Also, as it is you met this person,there are other people out there that may be better for a healthy friendship. Obviously, there's jealousy there and a sense of protecting something they consider to be theirs.
____________________________
Elleise
Clairvoyance Editor
Angel Therapy, Consultations & Courses