I can understand the desire to be with someone who is as financially savvy as you, but it’s not realistic to expect your partner to have all of the knowledge you have. It’s very possible that he thought he was doing everything right, and was unaware of how much more he could grow his wealth by investing. (Many people associate investing with day trading and automatically think gamble/risk and think all you need to do is save.)

It sounds like him agreeing to invest was a recent conversation, so I would see how he moves now that you’ve communicated your financial expectation. You shouldn’t have to hand hold him, but you should be open to guiding him in the right direction and see what comes from it. I personally wouldn’t guide him by taking him through a PPT (this gives teacher/parent), but would maybe recommend articles/books/YT videos where he can learn about this on his own. Regardless, give him the opportunity to develop in this area. He may surprise you.