I will throw in my thoughts the above ones are good too. Is their anything with you new job that you felt has changed you. Is your boss an asshole and pressuring you to do something, are you working longer hours. Do you feel your becoming more independent with yourself and less likely to need a Dom. You did mention you used to live together but now your going solo, getting groceries, and all other activities.

I would also keep talking to your Dom on a regular bases even if its just little hellos, and how you doing, as communication is very important in any relationship, It looks like you have this down and with him being patient and working with you one this does sound like he cares very much for you. I wish the best for you.