It's nice to help pay for things.
Dustin has been dating Katie for a while, and they are eating at a diner.
Dustin wants to leave after he is finished eating.
Dustin takes out his wallet and pays for the bill when the waiter brings it to the table.
Dustin tells Katie to pay for the bill when the waiter brings the bill to the table.
Katie is grateful that Dustin is so generous with his money.
Katie gets tired of paying for their meals all the time and breaks up with him.