[PSY]

I don't really think there's a "right" or "wrong" in this situation, because it all depends on when you're ready to throw in the towel. You could have done it much sooner and no one would have blamed you. You could have forgiven her once again, waited it out, then thrown in the towel later on if she hadn't really changed. While Sarah's apology did seem heartfelt (aside from that one part about her arm), it must have felt like it was "too little, too late" for you... and I can't blame you for telling her it wasn't enough, and that you wanted to move on.

I only have two recommendations after reading your post:

1. Get help for yourself.
2. Encourage Sarah to get help.

You said that you self-harm, and frankly, you appear to be easily upset by things that many people could shrug off. I hate to say that you have a thin skin... but you do. It's something you learn to toughen up with time, and I think seeing a psychological professional of some sort would greatly benefit you. You need to learn how to cope with the emotional pain you're experience. Cutting isn't a good outlet, and while crying is a more acceptable outlet, it could lead to problems later on if that's how you ALWAYS deal with highly emotional situations.

Sarah also seems to be dealing with an assortment of problems aside from your friendship. If you ever resume contact with her, I would encourage her to seek help just as you have - not because you think she's "crazy" or "psycho", but because you love her and want to see her get better. You may not be able to handle a friendship with her, but you were undoubtedly her friend at one point. The best thing a friend can do is to speak the truth, no matter how difficult that may be at times. I truly think Sarah could benefit from seeing a psychological professional as well.