Why do guys have no problem kissing another girl when they already like one?

naguala
this guy liked me but he was shy to come up and tell me about his feelings, I just discovered he liked me because his friend told me, and he doesn't know I know. lol

But before he gets the courage to talk to me he kissed another girl and he is now in a relationship with her.

I mean, how he kisses another girl that is not the one who he likes/loves?.
Why do guys have no problem kissing another girl when they already like one?
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