I [34 M] am somebody who inherited a lot of wealth from my parents, which allows me to support my ex’s daughter [10 F, from France and not my daughter]. To deal with the challenges of remote learning, I hired a tutor [19 F] to live in our home and teach her while I’m traveling for work. The tutor seemed a bit boring at first, but the more I got to know her, the more I liked her. We eventually really hit it off and got together after I broke up with my ex - now we’re engaged.

There’s just one problem: we were about to be married when my ex-wife’s brother [38 M] showed up and revealed that I’ve kept my bipolar and/or depressed wife [37 F] locked in a small padded room in my attic for the past 15 years. (Inlaws know all your skeletons. Ugh.) He then called me a bigamist in front of my girlfriend, embarrassing me and her!

Now my gf wants to break off our engagement…all because of a little spousal attic confinement! I tried to compromise - I even said that marriage wasn’t a huge deal and she could still be my mistress, but she won’t hear me out. We’re so in love, I don’t see what the big deal is…AITA here???

Tl;dr: AITA for trying to convince my 16yr younger fiancée to become my mistress after she discovered I kept my depressed wife trapped in a padded attic room for 15 years?