The friend in question has been living in a separate country from his girlfriend (of seven years) for the past two years. He has been finishing up his Master's while his girlfriend finished her Master's back home. 

About a year ago, he was going through some rough times in a foreign county, and made a close female friend. At some point, their relationship became physical and they were intimate at least a few times.

He called me one night to tell me. He sounded very remorseful over the phone and, as far as I know, he has not cheated on her again.

Now, his long-time girlfriend is moving in with him and I don't know if I should tell her that he cheated. 

To give some background, they broke up once early-on in their relationship (six years ago) for completely unrelated reasons. During that time, she was depressed, reclusive, and (potentially) suicidal. She alienated all her friends and family. 

Eventually, my friend realized he missed her as well and they re-started the relationship. As far I know, they have not had any problems since.

His girlfriend (who I am less close with) had a rough childhood and my friend has been her rock for the past six years. She is quite dependant on him and I'm worried what telling her the truth would do.

So, is it better to say nothing and hope for the best, or tell her that her boyfriend cheated, which can:  (1) make me lose two friends,  (2) break up a relationship, and  (3) potentially cause her to hurt herself? 

They seem very stable now and both are looking forward to moving in together. I have already decided that if he ever cheats on her again, that I will tell her. But I don't know if I should say anything now as she is moving internationally to be with him.
user
Friend cheated on his long-time girlfriend,
assistant
The friend in question has been living in a separate country from his girlfriend (of seven years) for the past two years. He has been finishing up his Master's while his girlfriend finished her Master's back home. 

About a year ago, he was going through some rough times in a foreign county, and made a close female friend. At some point, their relationship became physical and they were intimate at least a few times.

He called me one night to tell me. He sounded very remorseful over the phone and, as far as I know, he has not cheated on her again.

Now, his long-time girlfriend is moving in with him and I don't know if I should tell her that he cheated. 

To give some background, they broke up once early-on in their relationship (six years ago) for completely unrelated reasons. During that time, she was depressed, reclusive, and (potentially) suicidal. She alienated all her friends and family. 

Eventually, my friend realized he missed her as well and they re-started the relationship. As far I know, they have not had any problems since.

His girlfriend (who I am less close with) had a rough childhood and my friend has been her rock for the past six years. She is quite dependant on him and I'm worried what telling her the truth would do.

So, is it better to say nothing and hope for the best, or tell her that her boyfriend cheated, which can:  (1) make me lose two friends,  (2) break up a relationship, and  (3) potentially cause her to hurt herself? 

They seem very stable now and both are looking forward to moving in together. I have already decided that if he ever cheats on her again, that I will tell her. But I don't know if I should say anything now as she is moving internationally to be with him.
user
Friend cheated on girlfriend of 7
assistant