I need help 🙁 ,

I’ve had started cutting at a younge age and on the last day of school me and my bf were hanging out and he says let me write on your arm I said ok and pull up the wrong sleeve and he saw the 10+ cuts on my arm I’ve kept saying sorry by I’ve had made a promise I won’t cut again and I broke it and he said that it was ok bc he saw that they were not new cuts and he said to not do it again but after a month I’ve had started cutting i buy bracelets to cover them so no one sees them
I can’t stay away from razors ..
I hate that I’ve broken a promise a second time.🙁