Don't say gave in so harshly.....
OK, so you gave him the money. Remember they are experts at pushing buttons, manipulating until something works to get what they want when they want it. Please don't come down on yourself. All of this is a learning process.
I have to agree that boundaries appear to be in order. I would take steps to financially separate. You can file taxes separately., get separate accounts, etc. It sounds like the way it has been is a part of this diseases' insanity..... "IF NOTHING CHANGES, NOTHING CHANGES."