How to get back a girl you cheated on ?

Long story short a snowbunny catholic princess fell in love with me despite the fact that i do none but sell drugs and get high, one day i was at a rave party (i was there) for hustling) rolling of a x pill and i fucked a random girl then she found out, what’s weird is that she still liked me we kissed etc… but days laters she didn’t wanna talk to me anymore.

It’s been 6 months, she still on my mind, i thought that shit was gangsta but now i regret it, she was clean from all drugs, really a good influence and we used to talk on the phone every night.

I tried to comeback to her on snapchat where she didn’t blocked me, didn’t work, months later i came back with a fake account Instagram and still didn’t work out, I even asked a friend girl to talk to her but none worked.

What step next ?