I'm i letting him push me around?

i asked this guy out the other week and he said i had a fit *** but my legs are to skinny so no,ive been trying to make mh legs bigger but just as i was about to show them off hes now with my friend,grrrr,this really pisses me off,he's a loser,i know but why do i keeo running back to him?,why to decent girls always fall for such womanising jerks?