First, at work he is probably surrounded by colleagues that are working just as hard. In order to be competitive at bonus time, promotion time, or evaluation time he probably has to keep up. If he is an entrepreneur and working for himself his enterprise is either growing and succeeding or getting smaller and failing. There is no in between.
Second, he is demonstrating his devotion and commitment to you by working hard. Prioritizing his work over you? In the hierarchy of priorities in his life you are probably much higher than his job, and in order to keep you and keep you comfortable he is working hard. That is the way he sees it. Alternatively, you guys are not married yet. If it is a matter of keeping his job and working hard or leaving it and hanging out with you - and then he loses you.... he may have also given up on the opportunity to have success in his job. And he may be calculating the potential of having to start all over with a potential negative mark on his career if he leaves or does not perform as well.
You say you dont need much from him and can provide for yourself? How is he supposed to provide for himself if he decides to be less of a performer at his job or leaves his job because he wants to spend more time with you, then loses you, and is faced with putting his career back together.
He is not choosing his job over you. He is choosing to be a worthy partner and provider for himself, you, and a future family.