Some people love surprise parties, and others hate them; they like to be in control of everything, and they hate being caught off guard, even if it’s for a good cause. Personally, I think a surprise party is a nice gesture for someone; it shows you think about them and care about them and want to do something they wouldn’t expect.
The problem with surprise birthday parties is that it’s usually hard keeping them a surprise! The person usually suspects that something is going on, and in this case, this girl has fully blown her boyfriend’s cover. Nevertheless, she didn’t want to ruin his surprise and never gave it up. She must be a great actress because he still has no idea that she knew.