Why do some men pull away or disappear after I introduce myself?

I’ve noticed something confusing. When I approach a man, I always look for signs first so I don’t make him uncomfortable. Then I introduce myself politely by saying, “Hi, my name is Caitlin — what’s your name.” But some men suddenly go quiet, act distant, or disappear right after I say that. I’m not flirting or being intense — just friendly. Why do some men react this way to a simple introduction?

Why do some men pull away or disappear after I introduce myself?
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