I cheated on her and i want her back?

[Jonathan]

i basically kissed the girls friend i was talking to this girl for awhile i even lost my virginity to her so after that i got really attached and weve been through so much together, i know i messed up id take it all back if i could, i made out with her friend in her house while she was sleepin, in the morning her friend told her and she told me to leave her house she soesnt wanna see me or talk to me me and doesnt like me she said, i tried saying sorry and plzzz to talk to me but she wouldnt listen, i walked home crying and cried near my sister, that night we went to a party and i saw her there, on the way to leave i was like, lets talk and she said nah, i said are u sure and she said yeah and i havent talked to her in 3 days at all, she blocked my nimber and me on social media things, its so hard to see her kn school i really want her back what should i do? ik i messed up really bad