It's rude to miss a family member's birthday.
Jamie was invited to her cousin's birthday dinner.
Jamie wants to go to a bar with her friend instead.
Jamie goes to her cousin's birthday dinner.
Jamie tells her cousin she's sick and ends up going to a bar with her friends instead.
Jamie and her cousin go to the bar together afterwards and Jamie's cousin has a great birthday.
Jamie's cousin goes to the bar after her birthday dinner and sees Jamie there, which deeply hurts her cousin's feelings.