Awkward situation with my buddy, his GF, and my Ex

[FlyWf]

I disagree, you played this reasonably well. It sounds like Miguel isn't really grade-A friend material anyway, so [censored] any sort of "man rule" about not messing with his infidelity. But you aren't involved and it isn't your place to randomly call some dude's GF and rat him out. Providing some deep cover background to a trusted confidant of Brittany provides that information to the injured party without getting involved, if she didn't believe Blair she isn't going to believe you.