Just means you are responsible for deploying more liquid capital into productive assets. Have fun finding those. If you are creative and a builder, the people who made you what you are were the ones who told you "no," and now there are a lot fewer of those once they think you have money.
Barring a few quality of life things and some freedom, the rest is just symbols and artifacts.
That bit about finding a woman who will love him for who he is inside and not for his money is silly. In case he hasn't noticed, who he is inside is also now richer than croesus as well.
Very simply, the money event was a huge recent peak experience that totally re-based his identity, and until he either recognizes it again as external, or accumulates newer more intense experiences to offset it, he's going to struggle with accepting it and finding a personal equilibrium again. If he wants a partner to validate that he is more than his money, he's starting from a dangerously flawed premise. If he takes responsibility for himself and his identity and doesn't outsource his self worth to a partner/family, he'll be fine.
Otherwise, he should just put up a dating profile that says, "millionaire seeks emotional hostage for codependent death spiral." I'm a fan of Epictetus on that one, who essentially rephrases it so that things are not yours, they are things you relate to. e.g. the family I have, support, love etc, instead of "my family." It's not "my money," because it's not essential to who he is, it's "the money I have."
I'd say if he's looking for someone to complete and validate his essential idea of himself "without the money," he doesn't have a sufficiently complete sense of self yet to share. He'll probably be cooler after 40.
Anyway, good luck to anyone who ends up in this situation. It's rare and a huge distraction from more basic human needs that might have still needed work before the event.
I like to think I would make a very good rich person, but mostly because it sounds like an interesting job.