You should not make false promises.
Gary wants his girlfriend Amber to come with him to his brother's wedding, but Amber has plans to leave for vacation with her own family on the wedding date.
Amber wants to go on vacation with her family.
Amber tells Gary that she is not able to go to his brother's wedding because she is leaving for a family vacation on the same day.
Amber agrees to go to Gary's brother's wedding in order to make Gary happy, even though she doesn't plan to go.
Although Gary is disappointed, he is able to find a friend to go to the wedding with him instead of Amber, and he has a great time.
Gary is late to his brother's wedding because he was waiting for Amber, who never showed up.