>his bestfriends fiancé just called off engagement because of his infidelity

And your BF is still best friends with this person? And is putting himself in these situations?

Sounds like the best friend’s fiancée discovered something you’re about to find out the hard way.

Nothing wrong with being a wingman. There is something wrong with being wingman to your best friend who just broke off an engagement due to him cheating, lying about where he is, ending up at some random girls apartment with a best friend that you know condones cheating, and flipping it around on you that his lying is ok because you’re insecure.

You really don’t need to read the tea leaves here. He is best friends with this person for a reason, he thinks his actions and lying are ok for a reason. You know the reason.