I am so sorry you are having these issues with your boyfriend. It sounds like the change in your feelings has happened at the same time there has been a change in both of your work lives: You’ve been working less, he’s been working more.
This has thrown your world out of balance. And when this happens couples often squabble because each resents the other.
I think a few sessions with the couple counselor would be very helpful to do each of you in finding ways of supporting each other.