Resentment

So lately it appears that Darin is resenting everything I do. The more I do for the kids.... the more he resents me for not being equally attentive to him. I get that I just need to make sure that I think of him as often as I think of the children but how do I start? I mean... I am so annoyed by his attitude that I don't want to do anything extra for him. It's like I don't want him to win or something.... I just wish that he could talk about how he feels instead of acting like a child. It reminds me of when your older child acts like a baby to get attention! BLAH!!! I know what I need to do. I just want to do it with the right attitude and lately... I have more of a "stick it up your butt" attitude than a nurturing, kind, problem solving attitude!