How much should a Partner contribute

Here is the bigger question. If you became unwell and were unable to support yourself would he financially support you? Also if he became unwell or was out of work would you support him financially?
If the answer is no then he isn't a partner he is a room mate or border.
It sounds like he would like to not be treated as a room mate but someone who is a genuine partner, you know the kind that says what is yours is mine, what's mine is yours.
You need to go back and have this conversation again with him.
Also the entire split bills has other issues involved as what happens if he decides he wants to go on holiday and you can't afford to go? Do you stay home and he goes alone?
Personally I think if you are living together you should be pooling your funds and discussing what sort of spending money you can both have. Remember that when he moves in you might loose some FTB etc as in the eyes of centrelink you will all be a family now.