Can a hurt an Innocent girl just because the woman he's in love with asked him to do it?

Let's say the guy pretends to like the girl to lead her on and destroy her just because the woman he's in love with doesn't like her, would a guy who's in love with his girlfriend do this horrible act for her. (He also continues to harrass the innocent girl)

Can a hurt an Innocent girl just because the woman he's in love with asked him to do it?
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