Why would a guy sometimes feel the need to justify his actions to a girl who isn’t his girlfriend?

Why would a guy feel the need to explain and justify his actions when a girl didn’t even ask.

We are both attracted but he’s done this a few times, is it personality or something else?

It’s not like we are attached, so I’m not asking for him to justify stuff to me.

Why would a guy sometimes feel the need to justify his actions to a girl who isn’t his girlfriend?
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