So ex and I split recently (about 6 months ago) together 20 years and 2 kids. 2 weeks after the relationship ended he was picking the kids up in another women’s car and going on play dates with her. The women is his best friends sister so they used to go out a lot together gigs etc whilst I was at home oblivious looking after the kids. He swears this did not start beforehand but I am really struggling to believe that. He said they just decided to give it a try?