so you saw the ex and now you feel bad. You probably do have feelings, not to mention the disappointment of your marriage going south. you'll get through this too.
I hear you blaming your dog's infirmities on why you don't want to move, but i'll bet it's more than just that. You don't say how far the new BF is from where you live. I agree with kat. what's the rush? stay where you are!