TTEH !JXsxEkDBLs joined in and replied with this 13 years ago, 1 minute later[^][v]#443,087
No.
Anonymous C joined in and replied with this 13 years ago, 1 minute later, 2 minutes after the original post[^][v]#443,088
No responsibility, but you probably should.
Anonymous D joined in and replied with this 13 years ago, 50 minutes later, 52 minutes after the original post[^][v]#443,092
@OP
Rule #1 learned the hard way: never, ever get involved in someone else's domestic matters. It WILL backfire.
Rule #2 learned the hard way: deny, deny, deny.
Triptych !IupsXZPnnU joined in and replied with this 13 years ago, 8 minutes later, 1 hour after the original post[^][v]#443,096
Do it anonymously, with proof if y ou can.
Anonymous F joined in and replied with this 13 years ago, 2 hours later, 3 hours after the original post[^][v]#443,100
Honestly, I might if I were close to the person who was cheated on.
Anonymous G joined in and replied with this 13 years ago, 58 minutes later, 4 hours after the original post[^][v]#443,103
Do you stand o gain from the breakup?
Meta !PARAdoxiHw joined in and replied with this 13 years ago, 4 hours later, 8 hours after the original post[^][v]#443,112
@OP
Not unless you have a fiduciary duty as an agent of the SO.
TheSheep !kJ.A4PF7.k joined in and replied with this 13 years ago, 21 minutes later, 8 hours after the original post[^][v]#443,115
Only if the SO is one of your best friends.
Meta !PARAdoxiHw replied with this 13 years ago, 4 minutes later, 8 hours after the original post[^][v]#443,118
Serious answer, though: no. If you tell someone their boy/girl-friend has been cheating on them, it could backfire in a big way and cause all kinds of drama, and you'll get sucked into it by breaking the bad news. Stay back and offer support to the person when the inevitable happens.
If this person is very close to you, you might consider it, but be very careful. If it's an acquaintance, just stay back and try not to get involved.
Anonymous A (OP) replied with this 13 years ago, 4 hours later, 13 hours after the original post[^][v]#443,149
Thanks all. I'm not close to either party really (in fact I just met the SO), but the cheater just makes a mockery of him running around all the time. She's nuts. :/