If I don't know the person that well, I'm honestly not going to get involved. There could be a lot of things going on that I don't know about and I don't like to stir up drama.
If someone was cheating on a close friend of mine and I was positive that it was happening, not just a suspicion, then I would tell my friend. Again, I don't like to cause drama and sometimes it's easy to jump to conclusions that aren't really true. I wouldn't want to negatively impact a relationship based on a suspicion that later may turn out to be unfounded. Because once the seeds of doubt are planted they never really go away. I know that from personal experience.
I don't condone cheating, but I prefer to stay out of other people's personal lives as much as possible.
If someone was cheating on a close friend of mine and I was positive that it was happening, not just a suspicion, then I would tell my friend. Again, I don't like to cause drama and sometimes it's easy to jump to conclusions that aren't really true. I wouldn't want to negatively impact a relationship based on a suspicion that later may turn out to be unfounded. Because once the seeds of doubt are planted they never really go away. I know that from personal experience.
I don't condone cheating, but I prefer to stay out of other people's personal lives as much as possible.