I managed a good few years without SI (not cutting, something else), then 3 years ago I started again, I got that under control, but had two episodes earlier this year. I guess it never really goes away, even when you think you are past it. Try to resist because it will try and take over again, just like an addict with drink or drugs.
I find that just admitting that the urge is there really helps me to stay safe. So hopefully, this thread will help you.