He should've always shut up and do everything because that is what he should do. Do everything to make her happy. That having felt sadness is wrong for him. That even he shouldn't receive an ounce of comfort and understanding because he is just wrong.
I hope my friend realize that he's supposed to be loved for all of his efforts and time that he has given her. That love shouldn't be hurting him. He's so thick headed that he doesn't realize that he changed so much and he became miserable and lazy. Fuck up dude.