Oh shit this is a great idea. It's older man/Gal, where the power difference is explicitly spoken. I love how he accepted the DV too: something where he's scared that he actually did something to hurt his wife when he didn't mean to. That's such a gentle treatment of something that'd be easily disqualifying, and while the "SCUMBAG WIFE" response is clear in the comments here, it's also not the manga's take. He doesn't blame her, nor does he blame women. He blames himself, and as someone who's big and strong and instinctually physical, accidental use of strength in a way that would hurt someone is something he's justifiably sensitive about.
We glamorize and respect the idea of someone strong holding back, but doing it out of fear means they have a reason to fear. He knows how strong he is. He's scared of how strong he is. He's not going "I did not hit her, I did NAHT, oh hi gyuaru," he's come to the conclusion that it's possible he hurt her but didn't mean to, and that's something people feel guilt over.