Slept with my ex’s bestfriend, who has a girlfriend?

I can’t look at myself in the mirror
I can’t figure out a way to make things right, my ex was awful to me and never respected me so IDGAF about him but that poor girlfriend of his bestfriend doesn’t deserve that, she is abroad and has been there for three months and she has enough problems as is. What do you think I should do?
Slept with my ex’s bestfriend, who has a girlfriend?
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