Bring it on, ladies. She's been subject to emotional, psychological, and probably physical abuse for ages. You are nothing.
Y'know, the Duke reminded me of knight Leon in that Villainess turned Nun story. He's got this grumpy stern face and has a social awkwardness about him, but goes all in on some fairly pure feelings.
That said, the happy couple are being so sincere and honest with each other and I love it. He just wants to see her smile some more, and ended up ironically doing exactly what all the other women do to him. This is happy and warm and healthy.