Piano: - I desperately want to tell him I cannot be friends, let alone best friends with him after the destruction he has brought on me and his unborn child. I feel like I will never live with myself If I don’t say this.
You do not have to stay his best friend. That is a common WAH fantasy to keep being loved and trusted by those they have so wounded and fundamentally betrayed. You likely would not stay friends with a female friend who had treatd you this way. You cannot change your nature to suit his emotional needs. All the sons of the messed up cheating dads want to be told they're not the same when they act the same. Sorry guys. Live your own fantasy and take your consequences. You're adults.