Realistically he shouldn't care at all about any marriage arrangements. However, it would still be funnier if he first listens to the aunt seemingly interested and then simply says: "Nope" when she's finished.
@Nafizlatan yeah. You’re right, they’re perfect for each other, but what Chinese Manhua let’s the Mc end up with a slut? Chances are that she’s secretly pure.... and just brags.