Bet you weren't married at the time. I'm trying to re-learn calculus myself, and I have to hide it from her because she gets mad at me when I try to do calculus problems: "why are you doing this? Are you doing this for work? You don't have to do this. There's no reason for you to be doing this."
Gosh, that sounds terrible. Like it sounds like she doesn't even want to understand. Okay, you can study math if you give me three hours of "free time" and then she goes off shopping while you watch the kids after your math break lololol. Sorry man, that sounds like hell.