AITAH for wanting to keep finances private from in-laws?

I (f26) asked my husband (m28) to keep our financial information private from his family when we first got married 4 years ago. I won’t get into it but they are typical boundary crossing in-laws. I am guarded in what I share with them for many good reasons. I won’t share them here because the post would be too long, but just use your imagination.

I don’t want an added layer of financial drama in my relationship with them. Even though he doesn’t see the problem with sharing, my husband agreed we would never give actual numbers on salary/expenses/etc. It’s caused some arguments, but ultimately he said he would keep finances private, this was the standard these last 4 years.

Tonight, we were discussing our next step in buying a house. Somehow it came up that my FIL knows exactly how much we have saved up. I guess a few months ago he asked and my husband didn’t know how to say “none of your business”. I got furious. More so because my husband knows how strongly I feel about it and blatantly disregarded my wish to keep it private. He is mad because “it’s my dad I should be allowed to talk to him about it”. If that’s so, why did he agree to keep exact numbers private?

This led to a big argument about how I’m policing him, and that his family has commented on how weirdly secretive we are (ummmm yeahhh compared to them because they over share). I feel betrayed he did the exact opposite of something I asked of him and he agreed to. Anyway he was saying I’m being unreasonable and he should be allowed to talk to his dad about whatever he wants. I started yelling about how when you get married your wife’s wishes come before your dad’s and slammed the bedroom door. AITAH? How do I go about this?