Why do boys try to get the attention of the girl they care about a lot by making her jealous of the ones whose presence doesn’t really matter?

For example, if he really liked that girl, he would be busy loving her instead of trying to get the more important girl to pay attention to him. Do they really think it makes them more attractive?

It is a lot better to say sour grapes and go

Why do boys try to get the attention of the girl they care about a lot by making her jealous of the ones whose presence doesn’t really matter?
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