Our expert says:
I really don't see why people who have genuinely significant things to say to friends, choose to do so via tawdry methods like Facebook, rather than pleasantly and directly.
As I don't Facebook, the situation you describe wouldn't happen to me, but if it did, I would simply ignore the person for the next decade or so.
Who knows what's bugging him, but if he's an adult, he should calmly tell you and sort it out like grown-ups do. So I'm with Maria. Maybe send one more message saying you don't understand what has upset him so much, but won't bother him again, and if he wants later on to contact you, it should be in person and not electronically.
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