This is why you do not disclose your crypto stash to someone else, not even your spouse unless you trust them with your life or you believe that they aren't with you just for the money. The last one is very difficult to prove especially nowadays that a lot of people only want to exist and be showered with affection and pampered with material things. That is why I do not really agree to speed dating up to a marriage, not unless you know your soon-to-be spouse since childhood and you are sure that they won't flip the switch if it ever comes to that.
Hopefully though, the husband gets to keep whatever crypto he has for himself. It's bullshit that your spouse get to keep half of what you built way even before you guys met while the other doesn't really help add any value to your life in case you get separated.
We all know that once you are married, those assets that you have acquired at that stage of your life will be automatically become a conjugal property between you and your wife. So whatever you have, your wife will also have half of it. However, in this story, I think it’s quite unfair for a man to share his fruit of hardwork especially if he has gained it already even before he met his wife. That’s the reason to never trust anyone easily, even your wife as you can be taken advantage by it in the future.