Where does it go?

So we both got paid last week. And somehow I had to pay all the bills and the rent. And now somehow he doesn't have any money....

If I paid everything then where did his money go??

He bought diner a few nights and that's pretty much it. He had over 600 dollars so I'm very confused. And I'm starting to wonder if he's lying to me or if he's spending money secretly..

What do I do?