I agree with the other posters. My wishing my xh well with his second ow has, I believe, really upset him. He wanted me to be upset, and I am not [or at least no showing it]
Of course it is upsetting to see people parade their frankly adolescent behaviour in front of you and your children, and if it was anyone else you could dismiss it as pathetic, but it isn't, this is the man who you loved, and is the father of your children so it hurts a lot.