Dear masterminds of MN, please advise me:
a bit of background: split with exDP 3 years ago. I left him after more than 10 years together due to emotional abuse. We have teenage children. Since 2 years he is together with someone, we used to be in the same friends group. I have been avoiding them all this time as it hurt seeing them together at first and he made it worse then by playing with my head and oscillating between her and me before it was clear that she'll stay with him. She is much younger. My main concern at the time was that she will want kids and then to move back to her home city far away taking my ex with her.
Now she is pg and he expects me to be friendly and supportive. I cannot bring myself to do so, as it was clear that this was on the cards even before they got together - we used to hang out together during the separation year as friends. I wouldv'e not thought she 'd be so callous as to decide to get together with him as this would inevitably result him leaving his children from previous relationship behind sooner or later. At the moment he has little regular contact with them - I had to pressure him into doing it regularly which he agreed to only once the new woman was on the scene to impress and to help him!
Need advice on how to handle meeting her without coming acrross as bitter and insulting.