I hear you, so I'm trying to play this very cool, but sometimes it feels so stupid. Why don't I just go to her and say "You say you're worried I'll never get past what happened, yet you're keeping OM on your FB page. How am I supposed to let it go when you can't? Is keeping him on your FB page worth destroying our chances at reconciliation and us not going to Disney together as a family? Is this really what you want?"
Does that make me look weak?
Yes.
SHE needs to be the one to come to YOU, with a sincere, heartfelt "What will it take?" moment of contrition.