You maybe the perfect candidate for a secondary poly relationship.... you have your job/career, happy living alone ...you pop in every few month for some face time and a conjugal visit ....it could work out nicely ....however not as someones primary relationship. Or with someone who need live in arrangement. He on the other sounds like he wants and need a more traditional live in partnership that may involve sacrifice and compromise from both parties regardless of gender. A partnership among equals.
So what do you really want? If you like the current job and LDR you might have to learn the coping skills at being something of a secondary or tertiary partner. Adjust your expectations with the circumstances you've built.
I think if the next 3 month break is coming up that the 2 of you need to talk to a counselor to get some honest answers on what each of you see's as a ideal future and the compromises involved for each of you to be happy.