Both of your answers are good and I've previously considered both of them if the situation were to arise. I was leaning more towards diplomacy because of the fact that they could get back together at anytime and I don't want to seem like I'm hating...however, I have considered being completely honest because if I could show my friend what I've noticed and why I think he made a good choice, then I could save him a lot of wasted time by getting back with her....I dunno

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