I haven't cut for just over 9 months, longest I've ever gone since I was 15 and I'm 28 now. My SI was severe, I had surgery to correct tendons and muscles. My biggest reason to not cut now is that I DON'T DESERVE IT! You can't stop SI for some else, you can only stop for you. I think since coming to the realisation that I deserve to be kinder to myself, and that si doesn't solve any problem it just creates more