I cheated. What are my next steps?

I cheated on my girlfriend. I told her. She is giving me another chance. so here is where my question is - the girl I cheated with, I don’t have her on social media (I’m not on it) I just have her phone number. I deleted it, but then I added her back. We aren’t speaking or anything, I just need someone outside of the situation to tell me why I added her back because right now I can’t think straight.
thanks everyone
Updates
+1 y
Update - so when I originally deleted the other girl, she deleted me too. Then I added her back. We haven’t spoken I just don’t get why I added her back, surely it would have been easier to have left her deleted
Updates
+1 y
Thanks to those who have given me advice. And to those two people who have threatened/told me to kill myself: you should be careful about what you say on the internet.
I cheated. What are my next steps?
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