His perspective
What His Silence May Be Protecting Him From
In a resentful marriage, his silence may protect him from feeling exposed as the failed man in the room.
You ask what is wrong and hear “I’m fine” in a voice that makes clear he is not. This is not the sudden blankness of one overheated fight. It is the colder distance of a man who expects the conversation to confirm that he is inadequate, disappointing or already judged.
The no-win room
A concern may reach him as exposure: whatever he says will prove the case against him; whatever he has done will be recounted as too little; any admission will make him smaller. He closes before shame becomes visible.
The silence may be saying, “I cannot be the failed version of myself in front of you again.”
Explanation is not permission
His self-protection still leaves you alone and makes the house colder. Silence that is punitive, controlling or fear-producing is not a vulnerable pause. Where goodwill remains, ask for structure rather than instant access: one subject, a return time and no inventory of his entire character.
His part is to return with imperfect words instead of making silence the permanent answer. Your part is not to chase through a locked door. The resentment itself—not only the timing of the conversation—needs attention.