maybe he knows hes being a dick and wants to see if you'll stick around...
if so you need to threaten to get out of his life for good romantically of course...
and if he gets jealous easy...flirt with some guys at school in front of him...then he'll be running back..haha idk just babbling but its what id do..

or maybe you just need to move on to a more understanding less assholish kinda guy..

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We come to love not by finding a perfect person,
but by learning to see an imperfect person perfectly