Guy's Behavior

Why does my ex keep telling me about his new girlfriend?

We never officially dated and he rejected me a couple of weeks ago. I immediately asked for space and he’d message me every few days to ask if I was going to certain events where he’d be. Not even a week later he messaged me to tell me he was talking to another girl to which I gave a minimal response to and he got angry at me for thinking less of him even though the majority of the message was positive. Drama. My responses were cold, factual and minimal and his long and super emotional and making it a point to tell me they weren’t actually dating etc. Essentially he led me on and it is what it is. We’re on good terms now but I still don’t go out of my way to talk to him and he literally keeps messaging me things about how he is going to go on a date with her etc and I don’t understand what the purpose is. I get that he likes another girl, I don’t understand what it has to do with me anymore and why he has to remind me when I haven’t once tried to ‘win him back’. I don’t even want to maintain a friendship with him since it is harmful for me but it is more beneficial to be on good terms since we have a ton of mutual friends. I know if I call him out on it and it will be another argument and I still haven’t forgiven him for the last one.
Why does my ex keep telling me about his new girlfriend?
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