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Your best friend looks mad at you and he is ignoring you but he hasn't told you why he's angry and you don't have a clue what is bothering him. What should you do?
When he looks like he's calmed down, talk about it and ask what's wrong. If he keeps giving you the silent treatment, then just find someone else to hangout with. Let him know you want to know what's wrong to try to fix it and that you're willing to talk about it with him when he's ready.