Can a dishonest couple make it?

r/

My boyfriend’s bestfriend(26 M) cheated on his girlfriend(23 F) at a thailand strip clup(just a strip dance) during the first 3 months of their relationship. She doesn’t know and ofcourse she won’t be okay with it. They’ve been dating for 1.5 years now and plan on marrying in a few years. I don’t know her as well and didn’t find it to be my position to disclose that to her. I don’t know what to think about this, maybe they end up happy together even with the secret.

Even when my bf and his friends are on a trip, they both both don’t call each other for 10 days. But they still look pretty solid, given that they’ve met each other’s families.

Just need to rant it out and any opinions on such a relationship? Tl;Dr