Baby daddy issues

So my sons dad and I split up last year in may, he wanted to try with me again literally a month later and we did , up until November it didn’t quite workout, anyways, I found out a few months ago that he was talking to the girl I caught him texting back in 2023 which is his old coworker, yes it hurt but I got over it and didn’t even make a big deal out of anything. Did I crash out? Yes in silence in my room, because I was extremely hurt but I had to be strong for my 4 year old, come today June 13, 2025, a few days ago my sons dad kept wanting to talk to me and be friendly with me, even making little sexual jokes, and sending me pictures of him at the gym, & asking if I wanted to hang out and for us to take our son out together. (we haven’t taken our son out together in a while) just because I had to put a stop to it because any time we would hang out, he would flirt and try to hug and kiss me, and I would rather avoid that. Anyways, I really feel like texting that girl and showing her the screenshots of the stuff my ex texts me and tells me. But maybe I shouldn’t huh? Because then it would make me look crazy.