Is my ex mentally abusive or have mental issues?if i ignore him when will he stop contacting me&messing w/ me?

i was with my ex on and off through highschool-i believe that we were in love, however we bickered constantly-he would break up with me alot, only to get back together with me? he went on antidepressants and impulsively broke up with me saying that he didnt need me anymore because his medicine made him happy-i have since then tried to move on, dated other guys, but have not had a boyfriend-10 months later right b4 we leave for college, he contacts me & b4 we know it we're dating again-until he randomly broke up with me again-we talked here and there since that breakup, and now, 3 months later we hooked up again. I'm "talking" to another guy and trying to move on, but i just can't. he tells me he still loves me but that we cant be together bc my parents hate him &that i deserve better. Yet i called him last night and he didnt answer my phone call or call me back-if he "loves" me and "feels that he messed up so bad" then y isnt he trying to make up for that by treating me how i deserve?