Why didn’t he look away after I (F) caught him staring?

I caught a stranger guy staring into my eyes on the train while I was gazing the landscape. Our seats were opposite, so he sat approx. 1 m from me, so I’m sure he looked into my eyes. When I looked at him he didn’t even blink or get emberrased, he held eye contact. For me it was a bit awkward so I looked away almost immediately.

Why didn’t he look away after I (F) caught him staring?
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