My partner is 50 and I've been in a relationship with him for 4 years. Before me, he was in an 11 year relationship which he ended, a year before meeting me. Despite splitting up, he and his ex became best friends, often having dinner together, going out together, museums etc. They hadn't slept together, he says, for a few years but he moved out because she was a nag. I'm not sure if I'm being unreasonable, but I just don't like her. If we meet up with her she brings up holidays they had and mutual friends I don't know. Also when arranging meeting up, she always contacts him, not me, to arrange. She hasn't met anyone else in the time we've been together and I just feel weird about it all. Am I being unreasonable?