This is a gray area but as a friend it is always best to tell them as long as you are going to have substantial proof as he will not believe you otherwise. Also, you have to realize this may cause problems between you as you are going to be the bearer of bad news. You could always let her know and are going to tell him if she doesn't. Be sure your making the right choice but a good friend will always do so.
how do you know if your boyfriend has cheated
You can tell your friend that they are being cheated on or you do not do anything.
Yooh leave yoohr husband and he leave his gf cause they both cheated on yall!!!!!!!
You shouldn't have done anything with him knowing he has a girlfriend.
Grow up, please. If you like your best friend, you don't love your girlfriend. You girlfriend cheating on you is not reason or justification for you to do it back. You didn't like being cheated on, did you? So why would you do it back? You obviously forgave her & tolerated it. If you can't, LEAVE YOUR GIRLFRIEND. Do not go out with your best friend if you're not single.
say ignore them if they do it again
Just be on-est sorry i cant spell
Tell your girlfriend the truth!
He doesn't have a girlfriend because Kristen Stewart cheated on him for her director
Tell him honestly & as soon as possible. Don't omit information, either. You were reckless. Since you cheated, face the consequences.
tell them its in the friend handbook
if your girlfriend cheated,you should end the relationship