i think that now, especially now that you feel less resentment, you should tell him. you should tell him that at first it was really bugging you but that you're realizing now that things don't have to be perfect and always fair. tell him that sometimes your feelings get the best of you and you find yourself feeling resentful and it would help you immensely if he would just say thanks once in a while, or instead of ONLY saying how tired he is if he'd just say "i can't imagine how you felt, because this is killing me! it must have been so hard for you!"
honestly, i think that guys want the help. at least my guy does. he wants to do the right thing. he wants to make me happy, he just often doesn't have a CLUE how to do it.
i read some stuff on the "five love languages" -actually, a student of mine did a few semesters ago...and the stuff is great. i realized that my love language is "words of affirmation"...(the other 4 are receiving gifts, quality time, acts of service, and physical touch). dave's is a combo of words of affirmation and acts of service. he feels more respected when he comes home and the house isn't a sty. but i don't feel respect unless he TELLS me that he appreciates it. i'm much more likely to do more if he'd acknowledge that i've done it.
anyway, i think you should tell him that sometimes you need to hear things like that. explain that maybe it sounds silly to him and maybe he needs to be shown love in another way, but that's your way, kwim?
resentment will creep up again somewhere sometime unless you can be honest and open with him about it.