<human>: Can you summarize the given text in a few sentences?

**Background:**

There was a couple, lets call them Jim and Jenny. Jim was my best friend - I met him almost 5 years ago, but we started chatting often over 2 years ago. Jenny was his fiance, so she became my friend (about a year ago).

Four months ago Jim broke up with Jenny (after almost 4 years being together). And 2 months ago Jim got mad at me and stopped talking with me (due to other reason). And I think he won't be talking with me in the future.

**My problem:**

Before their break-up, Jim told me about his internet flirt (which was one of the reasons of the break-up). Few days ago Jenny asked me about things related to the break-up and I think she is suspecting what Jim did. She didn't ask me directly about it, so it was easy for me to tell the truth and not tell the secret at the same time. I think she has right to know, but Jim probably wouldn't want it.

I feel bad for not telling her. Although it isn't a lie per se, but for me it's an indirect lie. But if I tell, I will also feel bad - for breaking the promise. What should I do?
<bot>: My ex best friend [46M] told me about his internet flirt and shortly afterwards broke up with my friend [48F]. Now I don't know if I should tell her.