Honey, you ARE strong. You are on here asking for support because you know this is not what you want. The decision you are faced with is not an easy one for sure!! The reasons you’ve given for struggling with it are all very valid.
I think you just need to take it one step at a time. Right now is not the time to think about whether or not you will have your idea of family. You cannot predict that anyway, so stop. Even if you stay, who knows how much longer you both could spend doing this same old thing. As Dr. Phil always says (sorry if you’re not a fan, but he’s got some good one-liners) “the only thing worse than being in a bad [or just wrong] relationship for 3 years is being in it for 3 years and one day.” You know? Makes a lot of sense. I think right now you just need to check out places to live that are in your budget. Sure, you may not find something equal to what you had before, but it will be YOURS and you will not be waiting for someone else to decide where your life is going. Just because HE is not jumping at the thought of getting married doesn’t mean that YOU are not good enough!! His feelings say absolutely NOTHING about the person you are and your worth.