My husband never spends his time with me

I've been married to my husband nearly three years and we have a two year old son. I love him to pieces, but we keep coming back to the same argument.

He works 40 hours a week, and I'm a stay at home mum. But on his days off he just sits on the computer playing games, for most of the day.

If I ask if he can do something for me (housework wise or with our son) he just snaps at me, or says he'll do it in a minute but it ends up being quite some time later - which means I end up having to do it myself anyway. I know that I don't ask for anything unreasonable, but it does feel like he doesn't realise exactly what I do at home.

I understand it's his days off and that he's entitled to some down time, but when it seems to be more on that, than doing something with us, it really frustrates and upsets me.

I always feel like he'd rather be somewhere else than with us when he's on the computer. I have asked him before why he spends all his spare time on it, he says that it's the only thing he can do (as he doesn't watch telly or go out with friends).

I end up shouting at him and getting upset about it and he promises he'll spend less time on it and spend more time with me on our own and with our son. It works for a few weeks then it goes back to the same after. It makes me end up feeling like I'm his mum instead of his wife.

I just don't know what to do as I really love him and he means the world to me, but I just don't know what to do about it anymore!