What do i do to apolygise to my friend who is not speakin with me from 5 years.?

when i was in my 10 std. i had a really close friend, her name is sahana .we both were really close such tat we used to share everthing between us,but i evetually fell in love with her and even proposed to her. but for my bad luck even before she answered my proposal. we fought with each other because some one told her that i was talkin ugly things about her in boys toilet.but i really promise from my heart i didnt. anyway she got angry and stopped talkin to me.i am also a little possesive,so when ever she used to speak with other boys i used scold her too.i know its wrong,and i hav changed, but now i want my best friend back,never mind her love, i want my friend.its been 5 years we spoke to each other and even today when ever she meets my friends she keeps asking about me it seems, so guys plss tell me how to approach her,( I REALLY MISS HER A LOT)