If you can clearly see that he is in a bad mood (whatever the reason may be), do not keep asking about it again and again. Anger generally flares up when one faces questions like, “Are you okay?”, “Are you angry with me?”, “What is wrong with you?”, etc. Talking about his bad mood over and over again can make things worse. In case he really feels like talking, he would do that himself. Just give him some time to calm down.
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