Welcome to Hero's Spouse. From what you have written, it seems you realize that there is something "wrong" with your husband...he is different..."alien" is the word you used to describe him. It's very confusing to us because we still remember them to be the person we loved and married.
You said that you are living in a house that he owns...is this because he owned this property prior to marrying you? Did he legally exclude you from the title on the house?
I echo Baxter1's advice.....make an appointment to speak to a lawyer. Every state and country have their own rules..but generally the assets and debts are 50/50 between spouses unless there has been designated things that one spouse has that is separate from the other spouse.
Keep track of all your living expenses, everything from groceries to hair cuts, to travel expenses for at least 6 months so you can show how much you need to live on. Also, make copies of all important documents, taxes especially. Investment accounts, retirement accounts, bank accounts.
Just moving money from your joint account is not enough to protect yourself in the event of his deserting you. Legal advice and perhaps legal measures are important to put in place. I never wanted a divorce, I filed for a legal separation which I could do in my state because it split all our assets and allowed me to stay on his health insurance.
Although we don't believe they will hurt us financially, they do.
Take care of yourself, physically and emotionally. Exercise is important, meditation or yoga can help reduce the fight/flight/freeze response that is harmful for our well being.
Live as though he's never coming back...a hard thing to get one's head around...but MLC can take many, many years and the changes that occur for both of us is our new reality. Find new friends, new activities, new hobbies and if you need to upgrade your education to get a better paying job, try and do that.
You will heal, a good therapist can help. This is a very very difficult time and takes a huge toil on us.
Hero's spouse is a wonderful place to ask people's opinions, but your situation is unique and you will know what is best for you. Listen to your inner voice but make sure to protect yourself.