He chose her but tries to make me jealous all the time and push my buttons why?

I feel so hurt. He always stares, teases, eavesdrops, baits, provokes but he chose her and is with her and still tries to rub it in. If he wants to be friends fine but act like it and don’t mess with my head. Why is he treating me this way? I’m not imagining it. He deliberately tries to make me jealous..
He chose her but tries to make me jealous all the time and push my buttons why?
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