<human>: For some context, both of these two have been in a 3 year relationship, and are both good friends. The girl is one of my best friends. Recently, she has been telling me that things are very rocky. Some days she will tell me she wants to end the relationship, due to them constantly arguing, complaining, etc. 

I was contacted by the girl, and she asked me if her boyfriend had done any questionable activity at a party I threw a few weeks ago. I initially lied, however he had his vape at the party. She/they are a pretty religious couple, and she does not know he vapes. Her finding that out would be detrimental to their relationship. From what I judge of the situation, if I was to tell her that, they would break up.

If I was to do that, I would feel incredibly guilty as I would end a 3 year relationship. They have plans to marry, and he already has a ring, however he never talks about it, and I still expect they would break it off if I tell her. Not only would I feel guilty, I would surely lose a friendship from the guy, and have many mutual friends, where he usually hangs out. So that would be rough, and I know he wouldn't understand. And she would be sad, however I know that she would be grateful that I told her, and would rather know than to not know. 

I honestly don't see a positive outcome to this situation other than telling her the truth.

Condense the text into a few key points
<bot>: Telling best friend the truth about her boyfriend's habit would likely end their 3 year relationship. Don't know whether to say nothing, or tell her.