I promise that you will not be happy every day.I didn't exactly promise you will never come across a bad date.But I promise just that. On the worst days. I have to be next to you always.
I can not promise that you will have fun every day I can not promise that you will never have a bad day , but I have a contract. That in the worst days I have to stay here with you.
I can't promise that you will have a happy everyday I can't promise that you'll never had a bad day, but I promise only. in the worst day, I this person will always be by your side.