I have to hope that this will be an expensive learning experience for your husband and not just one of many such expensive lessons. He needs to remember this - If it sounds too good to be true you are being scammed. Unfortunately when people are desperate they can be the most vulnerable to a scammer which just makes a bad situation much worse. If this is a one time event, the two of you will need to figure how to cope with the loss. Most scammers are very effective at covering their tracks so the money is likely unrecoverable. But report it to the police anyway - That might help and also documents your loss. If husband is prone to doing foolish things like this more than once you may need to think carefully if he’s the one you want to keep in your life. The question is can and will he learn from this?

If you earned your own money, you wouldn't be so concerned.

If it was ethereum or bitcoin it'll likely go back up in a few years. Just resist the urge to sell at a low.

Was it a scam, or did he spend $5k and then the token didn't grow like he expected and it shrank? Cause like that's how it works....