Professing that "you're only being honest" is oftentimes an excuse for being unnecessarily cruel. Yes, that ittle boy or girl born with a cleft palate might not meet your standard of beauty, but what good did it do to tell her (or mother) such a cruel truth? Yes, he may be fucking around on his wife, but who are you to be the "truth-teller" and devastate a marriage of which you are not a part?
Unless you're flat out asked for the truth keep your mouth shut.