We used to be clenched until she...............?

So many years ago a good friend (back then) of mine slept with the father of my son when we were still together. At the time, I couldn't help but feel petrified because we were like best friends... I mean, our kids are months apart... time didn't heal. I however, retaliated and made sure she understood that she was in the wrong. I was young and dumb. Me and the father eventually parted due to the fact that he was just incapable of being husband material. After a while me and her repaired our relationship and found ourselves in similar situations and we became friends again. Distant friends, that is. Here's the thing, I can forgive, but once you've over stepped your boundaries it is no longer in my control. Anyway, she facebooked me " I Iove yous and that if she could change everything that happened before, she would". I no longer have any resentment toward her as I have already forgave her many years ago. What's out of my control is that she has lost my trust many years ago. When she messaged me she also said that she needed more female friends who are in relationships because her current boyfriend doesn't approve of other girls because of her pass.

So, what are your thoughts on this?