- I’m really, really sorry.

- Yay for the retirement fund!
- Re expenses: is there any way that you can pare them down a bit more, and stash some cash aside for future expenses? You may have some startup expenses as a single woman that could hit you hard. For example–and please, please consult with a lawyer about the laws in your state about this and your particular situation–do you actually own a car, or is it in his name, too? What about the house? You can expect at the least to probably need a security deposit for an apartment, possibly a 2-3 BR if you’ll have college kids coming back for the summer. Movers do cost money. Ditto any new appliances (washer, dryer) you might need.I am in the process of stashing cash, actually.
I do actually own THREE clear and free titles, on my own- my current car which we paid for by cashing a small mutual fund; my old car which son #1 drives around for work; and a car son #3 bough with his own money but it’s in my name for insurance purposes. The house is in both our names, and we have about 23 more payments before it’s free and clear. I expect that he’ll want to fix it up and sell it, and split the proceeds. I am thankful that he’s not vindictive in that manner.
If you generally eat lunch out…any possibility of replacing that lunch out with leftovers, say, 3x/week, and setting aside what you’d ordinarily spend? These things can add up. Similarly, if you’re generally financially-disciplined but don’t have a credit card or two, I suggest you open as low-interest a card with a decent credit limit that you can find. Pay that thing off every month, but have it as an option in case of emergency. We have one credit card with a crazy high limit and a fairly low interest rate that we have just a few bills auto-paid from every month to keep active. It’s paid off in full each cycle, but it means we have a 10K line of credit already available in case some sort of disaster strikes. Divorce does nasty things to your credit rating; it will be a lot easier to get a good deal on a credit card now than in a few years, if the divorce goes through. I would not advise putting your husband on this credit card; the last thing you want is to find yourself thousands of dollars in debt for his porn habit. (Ew.) I actually never eat lunch out. I work at a school, so going out to eat is impossible, so I save money that way anyway. I will look into a credit card that’s in my name outright - that seems a really good idea for “emergencies”. We married late in life (we were 33), so I do have credit in my maiden name that’s excellent. We have excellent credit now, as well.
(Before a certain type of comment comes in, let me emphasize that I am
not suggesting the OP run up a balance on this card. She could just use it for gas or a similar, regular expense that she’s paying for anyhow. The idea is to have a line of credit available if necessary, not to leave her potentially ex-husband with a pile of bills.)
Have your financial ducks in a row by having copies of the last few years’ worth of tax returns, W2s, mortgage documents, marriage certificates, family birth certificates, etc set aside somewhere. This is a good idea anyhow, regardless of how your marriage is; in the case of a fire or similar disaster, it’s that much less of a worry. Having them scanned into a flash drive and left at a friend’s house/safe deposit box/whatever (ie, not at the house) makes it easy to access. Take those copies/flash drive (if a flash drive, use two in case of one getting damaged) to a divorce attorney and see what they suggest and what sort of laws apply to your situation. You mention a retirement plan. You don’t want to find out a couple of years from retirement that while you’ve been planning on having exclusive access to that plan, your now-ex-husband is actually entitled to 50% of it and now you have to work 'til you’re 95.

I may just rent a safe deposit box at our local bank. We have important papers that I worry about anyway.
I hope very much that he changes his mind, repents, and seeks treatment, but if he doesn’t, then I hope the above is helpful. God bless and keep you!