Thats complicated.
Spoiler....
Dein end up moving in with Grayson due to dinner unfortunate accident. He tells himself that he doesn't have feelings, so they really are never 'together' but come to an agreement. It's only after greyson parts ways with Dein, after realizing his love isn't healthy, that Dein starts missing him. Truthfully you will understand, because it was a toxic way of loving him.
However Miller does learn about feelings, grows, matures, and goes on an apology tour.
Also, during thier separation Dein goes to visit him and Miller tells him to not come back. He finally realizes he loves the big fellow. I can't exactly remember how they got back together, but I believe i remember one of the conditions is that he quit the fire department. And Dein and Darling are able to live a carefree life.
Can any novel readers tell me how long it’ll be until they actually start “liking” each other from this point ?