I think my roommate should do my dishes for me.
Why do you want him to do your dishes for you?
I do a lot of work and he has more free time than I do.
You shouldn't expect someone to clean up your own mess. You should do your own dishes.
You don't understand, I just told you that I was very busy.
We all tend to think that our time is more important than other people's time. Even if it's true, you can't expect other people to pick up after you. If you really hate cleaning up, perhaps you should hire a maid.