Setbacks are hard but they do happen. Try to remember that it does not mean that you have fallen - just stumbled and you can pick yourself up again.

Honestly, I believe that it just takes time to move on. Re-evaluate where you stand and the reasons that you chose to stop SH. Take it one moment at a time and keep trying, using the support network around you including your therapist. While it can be hard, I am sure those around you will understand if you explain it to them. People generally get hurt and concerned when a person does not want to change a self destructive action, but from your post it does not seem like you are at that point. You don't appear to want to continue to harm yourself.

Try to remember:

"Courage doesn't always roar. Sometimes courage is the quiet voice at the end of the day saying, "I will try again tomorrow". ~ Marry Anne Radmacher