Sorry to hear you're going through a tough time, DG. We understand how it feels. It's never easy, especially if you are living with someone. But it sounds like you've thought this through for a while, and you are doing what you need to take care of yourself and get where you need to be in life. Your reasoning has been found in sobriety - this was not a drunken whim. Big life decisions are always full of holes and ripe for regret.
I once went through a similar experience. I read a quote, I don't remember who said it but it went something like this: "Change is hard, and it can feel dangerous. But sometimes it's more dangerous NOT to make a change". Follow your gut with this one. You have been wise in most decisions so far, and this is a natural and reasonable transition for you at this time. Do whatever feels right, and good luck with getting through this.