Should I apologize?

This girl was my best friend once and she said we could be the best ever at one point. There was a strong bond between us, strong enough that we confused our friendship and thought about dating. I kissed her once. But anyways, instead of dating, the timing wasn t right and it went up in flames. I cussed her out over text on two separate occasions about a yr apart for her saying we could have been the best ever and flaking on me when she could have told me no straight up.... I tried apologizing over text and she said she call the cops on me if I try to contact her again. I ve never raised my voice at her and had an argument in person.... anyways I plan to leave a letter on her car saying sorry and 40 bucks so she doesn t call the cops on me. I know she won t forgive me and want to be my friend again, but the cash is for the trouble I gave her... it s been 1 1/2yrs since we have been friends and about 3 months since we last talked. I want to apologize and be a man about this, instead of some say sorry over text... this will be the last time I ever reach out to her. I be crosssing the line but I need to speak my mind and tell her I really am sorry...