I might be way off the mark here and I'm sure IABU but I've been stung before with this one.
My bf has moved in with me and because of this in the last month he has seen his ex 3 times to collect stuff he had left at hers. . This hasn't bothered me at all. One of the times her new dp was there but wouldn't come out and meet my bf, thought that was a bit odd but there we go. We have been together a year and up until a month ago he only saw her once before that. They split up Nov 2017, after 14 years. No DC's
He is seeing her again on Saturday to give her something he has decided won't go in my house but will go in hers. Then they are going for a walk. I do not have a clue why this one is bothering me but it is.
My ex had a weird relationship with his long term ex (she lived next door, they were best friends but really couldn't dependent) so I really didn't want to go down this path again. He barely saw her for the first 11 months so I thought it was fine. Am I being paranoid and unreasonable? He us basically giving up a Saturday with me to spend with his ex. I find that a bit odd but I know rationally I'm the one with the issue.
So as not to drop feed, there is a huge age gap between them (18 years) he was 17 when they got together and sometimes I feel like she has moulded him and some of his interests and opinions are definitely hers. Again, find this odd. Just feel unsettled and need an arse kicking I think.