Bonecrusher

How about you try staying in a few times. Rent a movie. Order a pizza..or better yet get a frozen one and pop it in the oven. She'll end up asking you why you aren't going out. Tell her you are trying to pay off a couple of bills or had your hours cut back up at work.

Blame it on the high gas prices. Maybe then she'll offer to pay. If she doesn't then you can have the conversation about going dutch or something.