I need help to get my ex back, please no "MOVE ON" lmao sorry but i'm sad.?

so i met this guy.my freshman year and i was so stupid and young.i fell in love with him. (first love). i lost my virginity to him.yes i loved him with all my heart.but i made stupid choices.i cheated on him.and he left me for this chick.but now 9 months i changed.i haven't been with anyone.i had time to think.but he's with the other chick.now i honestly really want him.i've grown up and he doesn't believe it.he thinks i'll be a whore forever but in reality i've grown up and i could give him back what we had.but he's with someone so awful.he even knows it.but he's told his friends it's only because she won't cheat.just please..help me win his heart.i love him.id die for him.i won't be moving on anytime soon so that won't help.anyone is you've been in this situation help me.i'm only 17 but i miss him and cry all the freaking time.please and thanks guys.it means more then you could imagine.