I cut sometimes, too, and it can feel like a huge personal failure when you relapse back into it. But you're doing what you need to do to cope. Sometimes we go back to bad habits and that's okay. This is how you controlled your emotions. We can always start that streak again. And while it's painful to look at your cuts and think of them as failures, it's better than not finding an outlet.
You're doing good, because you're still here. Even if it's not the ideal way to manage your emotions, you're another step closer. Cutting again doesn't bring you down to zero days 'sober,' It's just another step towards being okay.
Im rooting for you