Hi SYH, you sound like you're having a wonderful revelation. I was wondering whether you have a plan for if he changes his mind and decides to move in again?
You sort of did this by stealth, nothing specific was said, and he may be surprised that its over from your POV. Are you willing to tie up the loose ends? For instance, there may be liabilities if you're still married, like debts. You're presumably also next of kin to each other.
You sound so happy it may be best to use the momentum to go further and initiate formal separation.