if he’s brooding and sulking as a reaction to an argument or something you said or did, then I would first understand where this reaction comes from. Sulking is a manifestation of anger. People get angry when they feel hurt or ignored.

As frustrating as it may be to be on the receiving end, the “sulker” usually just wants some emotional reassurance and support. The problem is they don’t know how to explain or ask for it. So they sulk, like a child. I think a lot people who don’t feel comfortable being vulnerable or admitting they have emotional needs suffer from this knee jerk sulk reaction.

These patterns are wired deeply in us since childhood and they can’t just be unlearnt overnight. You can force someone to open up. I think the only thing to do is be compassionate and empathetic. If he’s sulking, ask questions. If he refuses to answer; reassure him. Tell him you love him and tell him you want him to feel safe and comfortable. And you’re here when he’s ready to open up.