Should you tell the wife?

If I have a strong personal attachment or relationship to the wife, like if she's a very good friend, or my sister or a cousin, then by all means I will tell her something about it. I'm sure she would appreciate to hear it from me than somebody else. I also expect the same courtesy if ever they see my husband doing the same, and I sure do want family or close friends to be the ones to break it to me than someone else that doesn't really care about us. But if we're really not that close and we're just mere acquaintances, then I will stay clear of it and say nothing. I might end up being the trouble-maker here and that's the last thing that I need.

Usually when you get into other people's business it doesn't end well for you especially when it comes to romantic affairs. If you tell them they may turn against you. It depends on how well you know someone. Maybe the wife/gf already knows and accepts it. You never know. You never know what goes on behind closed doors in someone else's relationship. Maybe the best thing to do is to send an anonymous note of what you saw.

I will make an effort to tell the wife IF she happens to have close ties with me (cousin, sister, aunt, best friend, etc.) but if I don't have any relationship with that woman who is unsuspicious of her philandering husband, I'll just leave them alone because I don't want to get into trouble.

It is a sensitive issue,first you need to determine the objective you want to achieve like do you want to break the marriage or help it to grow.If the aim is to help that marriage,it is best you confront the adulterous husband and offer words of advice.It should not be your business to report a man to his wife,that to me is immature and insensitive.Let the woman find out the unfaithfulness herself and decide on the course of action to take. This way you save yourself being branded a meddler or being called uncomplimentary names.For if you report the adulterous husband, it could lead to marriage failure and this could have a chain effects,the children will suffer,and the man will lose focus and it could affect his career, in this case you have only worsen the issue.So be guided by discretion,consider the outcome in the long run.Am a product of a broken marriage I know what it means to be a product of a broken marriage.

If I know the individuals involved then I would tell the wife. If I don't know the person involved I would just stay out of it. Many people get really hurt and upset about these things and feel that their life is ruined and the person telling could get into a lot of hot water if they are just trying to air out something and don't know those involved.