SI is very much so an addiction. I suggest you get help if you haven't already done so. I'm glad that you realize that you don't want to keep cutting because recognizing that is the first step to healing. Admitting it here proves that you want to do something about it and for that I am proud of you. The decision to stop SI'ing will change your life in so many ways. It will be a long and hard journey but it is so worth it in the end. You've fought it before, you can do it again.
Finding someone you can trust and talk to like a T will benefit you greatly. You don't have to do this alone.

Do you remember exactly how you felt before and after you cut? If so you might want to try writing it down and going from there.

Best wishes!

-Moon