I would not pay down a mortgage with such a fantastic rate. That is the right answer financially. You can do better than 3% with zero effort and low risk by dropping the cash in a HYSA.

Others see value in the security of owning their home and having no mortgage and that brings them peace of mind. Nothing wrong with that, but this is a financial sub.

I do not understand the "pay my wife back" part, but I guess thats a different matter entirely.