How can I make up for the mistake?

I'm M / 13.

I have to confess. I slept with my best friend's girlfriend 6 days ago. I've known my friend's girlfriend since elementary school. We're just friends and (not in love or something) and get along very well with each other.

And this is how it came about:

I invited her so that we could play Minecraft again and asked her if she didn't want to stay the night. She says yes

Then when we went to sleep (you on my bed and I on a mattress on the floor) she came quietly to me and lay down next to me. Suddenly she kissed me on the cheek. And I was stupid too.

I feel really bad now. How am I supposed to explain this to my best friend. I don't want to destroy his relationship and our friendship.

Honesty fights the most. Even if this could break friendship, it is only through openness and trust that a new friendship is possible.

Honesty takes you further in life and also puts you on the right path

"Honesty is the best." ;)
Comes from "while" and has nothing to do to "defend" me:
https://www.duden.de/rechtschreibung/waehren

If you address it, it will most likely have consequences for you and yourself. At least "cracks" are likely to carry off relationship and friendship.

In this case I think I would rather not say anything and plan not to commit such stupidity again. If it was one.

Ups thanks haha

;) Always a pleasure…