My long term boyfriend and I split up for 9 months in which time he started seeing a much younger woman at work. After a few months he finished the relationship and we started seeing each other again.
He still works with her which I accept, but during the time they were together he introduced her to a hobby he has with his mates and she turns up on social occasions to which I am not invited ( as he thinks it would create bad feeling for his mates himself and her) .
I am not ok with this and have asked him to do something to change the situation which he is refusing to do.
I don’t think there is anything going on romantically, however it doesn’t sit right with me especially as they have exchanged private messages outside of the group what’s app which he initiated and offered her a lift “with the boys”
Should I put my foot down and offer an ultimatum or suck it up and hope she gets bored of hanging out with a group of old men ?