Why do man have interest until I show them I have interest?

The same thing keeps happening. I’m not someone whose attention is easily won and I’m very selective and I am known by this. But as soon as I show interest back to a guy they just become distant. It doesn’t matter whether it’s for something casual or not. At this point I just wanted something casual and after the guy texted me about when he sees me again I made myself potentially available and he ghosted me right after. I don’t know what I do wrong.
Why do man have interest until I show them I have interest?
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