I need an honest opinion - why doesn't he want to let me know about his dates?

I was seeing a guy and it got pretty serious to the point we loved each other. But we decided that it wouldn't work and we'll be friends. We still talk to each other.

He started dating again but he was hesitant to tell me. I figured it out and asked him about his date. I was genuinely curious on how it went and open to talking to him about it since we're friends now. He didn't like that idea. He doesn't want to talk to me about his dates which I couldn't understand. He said he doesn't want to hear if I ever went on one either.

I just can't understand why he wouldn't want to talk about it with me? I'm not jealous. If anything I was being supportive of him and his dates. So I need guys insight as to why he doesn't want to share that with me.

I need an honest opinion - why doesn't he want to let me know about his dates?
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