My ex and me have been separated for 12 months and in this time he has had two new partners. His first partner was abusive and I was very reluctant to let him introduce our dd ( currently 19 months) to her. He agreed and they quickly split up. He has since moved on and been dating another woman since June. She is nice and I've personally met her. He still pushed me to allow my dd to meet her just 5 months into their relationship. Their contact is starting to really get me down though, as I'm now aware it was way too soon. Ex has said he waited ages and I'm completely out of order. Aibu? For reference, I've not dated anyone since our split