I think you need to take a step back and have a good think.
Say he said yes to getting married & you got married next month, what actually changes? What 'security' or benefits does it actually bring you? If someone wants out, they will leave - married or not.
Moving - married or not, do you actually want to move? Do you actually want to leave your friends & family & have to start over with your business?
I think your desire to be married (just BE married, not even especially to him) is clouding your rational thinking.
As I, and others, have said already...HE s choosing to look further afield for jobs, he's not thinking 'Keep's' life/career is here, how far from here can I commute & looking at jobs within that area, he's just assuming you will move with him & is justbtelling you where that might be to.
He REFUSED to marry you because of £8k start up finance, but he's happy to get you to move, reduce your business to zero again, without a second thought. Nice. Not.
He might 'adore you & do everything for you' on a day to day basis, but that's superficial, when it comes down to important things he doesn't want to know. You are over looking his massive faults because he treats you like a princess. Not. A. Good. Idea.
Lots of rental properties will take dogs once they've met you, you might need to pay a bigger deposit. Imagine how much more trapped you'd be if you moved with him, had no income & had to or wanted to leave. You'd be screwed...and that's without considering the dogs.
I think if you push him he'll agree to getting married & having kids. You'll move & it either won't happen or he'll tire of it because it's not what he really wants and you'll be up shit creek, tied to him for life, responsible for the kids, little or no income and a couple of dogs.
I don't know what else to say to open your eyes, it seems like you're just too hung up on getting him to marry you to think straight. 💐