turtle...
I've been thinking about this. I agree and disagree with Ff
I do think it's probably because you appear to be coping so well. I know there are a handful of times I've obviously appeared ready to drop / kill someone and DH is first there doing whtever he can and telling me to go back to bed..
But, I don't think you should force your Dh and DS to have any particular sort of relationship...
I think, right now, you need to focus on what you need a little bit... For me, I wouldn't get upset where or how your DH and DS go together... I'd never expect DH to take DS to a group where (i) it was mostly women or (ii) he was expected to sing.
It's not fair on him... I enjoy that stuff, he doesn't. As long as I can say: Please look after / play with DS for a hour so I can do X,Y or Z, and know DS will be OK, then that's fine with me. Yes, they need to spend time together, but what they do and how they do it should be soemthing they work out together.
I also think that, if your DH is overlooking your needs to a degree, then you should consider doing the same... what I mean is: Take DS out, whatever is fun - the swings, a playdate or a pottery painting place, and if the house doesn't get cleaned.... oh well... If you are missing out on fun things with DS in order to do things you don't like (such as cleaning) and then not getting any respect for that, then you are going to feel resentful..
Can I ask: Did you work before your DS was born? Are you now a SAHM? That has happened to me, and it's taken something of a re-adjustment for both of us (In fact, something I'm only beginning to feel better about now I've been accepted on to teacher training and can see a light at the end of the tunnel!!)
HM