Doing this is not normal. We don't like being this way.  

You go a long span of time clean, and then bam. You mess up. All you can feel is guilt and shame for going after the release. You beat yourself up for it.

I speak of that from recent personal experience. Support people when they relapse or it'll keep happening. They're already feeling shitty don't make them guilty for it. 

Chances are they're already guilty and sorry for existing. People that self harm aren't typically happy, self loving people.

The guilt consumes you like the darkness in your head. And leads you to go back down that road of endless shame and broken blades.