Why would a guy get a girls attention just to play mind games with her?

I really don't understand. I was minding my buisness & in my own little world. Why did he have to knock me down. I'm already a bit depressed as it is.

Like do guys just find a pretty girl and decide to make contact with her all to just waste her time and to play a game?

Why would a guy get a girls attention just to play mind games with her?
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