On the face of it, she had a cosy play hour with your son in a park. She must have thought she was manouvering closer to him. But he "hated her for it". Wow. Seems to me she was slowly hammering nails into her own coffin but what a shame it took him so long to end it. Then it has taken him a LONG time to get over what he did and fully engage in family life and your R again. So all in all... a long, slow, painful trajectory. The evidence is there in that HE FINISHED WITH HER. FOR GOOD.
You have to keep reminding yourself of that. Like someone here said, she was an extension of an overall sad sitch/time in his life. You could try to take a more holistic view maybe and stop focusing on the details (they spent X number of nights together/she bought him a jumper/he took her to a villa). I just dont believe she ever made it into his soul, I dont see that he had a soul connection with her as he does with you?
Have you asked him this? And about replacing her/you etc ??
- What would you have done if I HAD moved on and didnt want you back? Would you have stayed with her? Would you be with her now?
I asked bf this, he said yes it would have gone of for a bit longer as he would have dreaded breaking up with her, hurting her and the fallout, but that trying to win me back galvinised him to do it sooner. If it wasnt for me then yes it would have limped on a few months longer but NO, he wouldnt have stayed with her. Categorically not. That did help. I am sure H would give you a similiar answer? xx