A man who can't address
your concerns without becoming
hostile or dismissive is concealing
far more than just that response.
Write that down.
His anger is the tell. When she asks a simple question and he explodes, he's not reacting to the question he's reacting to being held accountable. His defensiveness proves he has something to hide. His hostility is admission without words.
A man with nothing to hide answers questions calmly. A man with secrets gets angry. She's asking because she sense dishonesty, and his explosive reaction confirms it. He's not upset because the question is unfair, he's upset because the question is accurate. His rage is a confession. His defensiveness is proof. She doesn't need more answers, she has all the evidence she needs in how he responds to her asking questions.