If Your Very Best Friend Was Cheating On His Girlfriend, Would You Tell Her?

Hey Lily3, I cannot argue the above points, suggestions and opinions.  They are all valid.  However, if I felt uncomfortable with them both being in my home at the same time....I would ask him not to bring her over.  If he asks why, tell him, because she is my friend too, and I feel like I'm betraying her with this dirty little secret you have.  I also feel like you are overstepping your bounds in this friendship by basically asking and assuming that I will lie for you to cover it up.  That's not friendship, that's being used.

I'd want to know, and to be honest, the boyfriend would never know how I found out.....I'd just tell him that it's time for us to part ways.

I think your best friend would feel betrayed if you just told on him.. But I think if you feel strongly about it.. You should warn him that if it doesn't stop or if he doesn't say something then you will tell her as you consider her a friend to take into consideration though that not everyone appreciates the truth and sometimes they don't believe you.  Many times the Messenger is the one left out in the cold.  Tread lightly.

He is your friend, and he should take how you feel into consideration. If he doesn't heed what you say shortly, then I would tell her about it. This is going to most likely draw a little bit of a wedge between you, but he will then know how serious you are about it all. Hope this helps, and best of luck to you.

Talk to him about what he's doing and see if you can find out why. Then maybe you could hint to his girlfriend what he likes and basically what he said, if things don't change then see if you can 'coincidently' meet them up so she sees him with the person hes having an affair with. If you respect your bestfriend don't tell her straight out otherwise all friendship will be lost.
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Maybe you don't have to tell.....just arrange it for her to show up unexpectedly where he is with the other girl.  I'm sure you can come up with some thing.  Use your imagination!

I agree with Rhyan and Anonymouse. If you tell. Sure they will argue about it and may break up, but they might get back together later and then you would probably loose your friend.

She would want to know so you should tell her he is cheating and leave it at that and let her decide what to do. I would tell them just because I am a honest person and would hate to see someone else get hurt the way I have in the past. They may get mad, but later they will thank you for it.

When I was in the same situation as you, somebody suggested that I send an anonymous letter to his girlfriend telling her details.  That way, I have done what I feel is the right thing to do, I let them work out their relationship issue and I keep my friendship.

I wasn't so subtle when I told my best friends girl . . . It hurts that he has turned on me so badly, after 8 years and two kids together. But he couldn't stop on his own, no matter what he said. He said it was his problem to handle. But he was making no progress. I tried to get her to confront him but that went sour because she kept pestering me about what it was exactly I needed her help with. I hope things worked out better for you than me. As much as it hurts, I don't regret so much as doing it than loosing my best friend.