Who should pay the bills after all?

Hi guys and dear ladies!
When a man doesn't pay the whole bill or asks for cash back or even doesn't cover all of the expensives when live with girlfriend or wife, does this makes him less worthy?
Do you believe in the 50-50 thing? Do women deserve to have a man who is even keeping his wallet in his car even when he's home?
Who should pay the bills after all?
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