DS1 is 20yo. Has a very serious GF of 6 months (I'm not sure if this is relevant)
He has a friends since school who has been seeing someone else they know from school for several months. DS suspects he was cheating on her earpy in their relationship and he's really upset about it and in a proper dilemma about what to do. He doesn't think it's still going on.
I'm inclined to say, leave it be, you never know what's going on on other's relationships, she may already know, perhaps it was before theybwere exclusive, the messenger always gets shot etc.
Although I'm aware MN usually says they'd want to know. Does this still apply for young relationships?
TBH it's something of a surprise to me to discover DS even cares, but I guess that'sa good thing?