trust is such an important thing that a lot of people take for granted till its gone
and you left her with a year of contemplation and all her friends talking bad about you to make her feel better. so if youre just a fckboy trying to get back in there, change that mindset. you have to win over her and her friends now, who shaped you as the villain most likely
i would apologize for hurting her, that is all. then try to see if you can be friends again, it most likely will be a slow process gaining her trust back, so buckle up if shes really worth it