Should this make me worried?

My boyfriend (he’s been separated for 10 months) and I have been dating for a month. Today he told me “I have to tell you this, it’s eating away at me.” He told me he finally talked to his (ex) wife and they talked on the phone and “caught up” as he worded it. She randomly left him after 5 years and had all his stuff packed up one day when he came home, and he never got closure from her or talked about why she left. He said that they FaceTimed, and he told me he asked about her dating and love life and she said that there’s not been anybody. He said “oh so no one night stands?” And she said “nope, there’s been nobody.” To me, that is very weird and is making me freak out. Why does he care about her dating and sex life if he’s so happy with me? (As he says.) if she did him so dirty as he’s told me, why would he want to “catch up” with her? And he told me he flipped the camera around and showed off his weight loss and beard to her. Why does he care what she thinks? He also told me when he mailed her ss card and took a picture of the receipt, he got the Audi logo of his steering wheel in the pic, to show off too. Part of me is glad he told me, but part of me is very uneasy that he’s saying the things he’s saying. He also said he brought me up to her but I’m kind of doubting it, and even if he did, I didn’t want her knowing or anyone else until we’ve been dating for a while, because she loves drama and I don’t want anything started until we’re 100% ready. Should I be worried? We just got off the phone and I made up an excuse as to why I had to get off the phone but I’m fuming. How should I bring it up if we talk about it?