continued contact with ex making me crazy

[MrBond]

"he thinks we are best friends, and I do not think to this day he realizes how his actions totally devestated me."

Then the next time he tries to be all chummy with you, keep your distance and if he keeps bothering you, tell him straight up about the hurt you've been through and how clueless he is. That you are not his friend and that he had destroyed any chance of that with his choices. Then just walk away with your head held high.

Unless you say something, nothing is going to change.