Apologising is a sign of weakness but not between friends,I am sorry and I am sorry and I am sorry for upsetting you and I am sorry for freaking you out by my behaviours and I am sorry for hurting you and I am sorry for being total bastard and I am sorry for stupid things I said and million times I am sorry, doesn't matter how many times I apology its not going to fix anything, just want to say that I do care about you and I do like you. I promise, won't bug you again.
If you want to think that I am pathetic, needy, weak or anything else, I prefer to be those then hurt or upset a friend.

How about this... You as a friend know me better than anyone.
I apologize for everything. You know I would never hurt you intentionally. Please forgive me as I was so uncaring and selfish.
I know our friendship is over and I can't take back anything I've said or done. I wish you the best and I will not contact you again , although, I will miss you.