<human>: So my friend, let's call her S, has been in a long term relationship with J for a couple of years now. Recently life's stresses have been getting into their relationship and S recently confided in me that she had cheated on J with another mutual friend (let's call him P).

I spoke with P about it and he admitted what he did was wrong and he called it off and has tried to create space between them so they don't continue the affair. The problem is, I like hanging around with both of them but the chemistry between them is clear to see so throughout this whole episode I feel I've lost a friend as they won't meet up together.

Now comes the main issue. I can't stand cheating, but S is my friend. Should I tell J, who I don't really know, or should I stay true to my friend and say nothing? Is there a middle ground where J can find out but S will not suspect me so I don't lose a friend (possibly more). I'm in a moral dilemma and everywhere I turn I'm bound to lose, can you help me reddit? Any advice is welcome!

Can you give me a shortened version of the text?
<bot>: friend cheated with other friend. Feel like bf should know but don't want to be the bad guy and lose friend, what should I do?