Mutual date? You pay for what you ordered, unless the other person insists they pay for you too.
Your treat? You pay, unless the other person insists they pay, or at least for what they ordered.
Their treat? You offer to at least pay for what you ordered, otherwise they should pay.
Out with friends? You pay for what you ordered, unless someone insists they pay for you.
It all comes down to logic, courtesy and equality.
It's late, so apologies if I've worded this a bit weird.
Your treat? You pay, unless the other person insists they pay, or at least for what they ordered.
Their treat? You offer to at least pay for what you ordered, otherwise they should pay.
Out with friends? You pay for what you ordered, unless someone insists they pay for you.
It all comes down to logic, courtesy and equality.
It's late, so apologies if I've worded this a bit weird.