I understand so much how you feel. I don't think I can be friends with ex if I don't get a sincere apologise, and this will never happen. On a positive note kids told me today that they like staying with me and that their dad is a boring dad. Basically each time he comes to see them for his hour visit he takes them grocery shopping! Maybe taking them to see their aunties or grandad could be better but not my problem anymore.
Another good notes both of my kids have super cuddly lately and I have enjoyed every minute of it.