If Brandon hadn't shared his plans with the other girls, it wasn't her place to go blabbing them now.
There's nothing you can do if he breaks a trust and starts blabbing, but most likely, if you just politely pull way back and leave him alone…it will be fine.
If she rejects you and makes fun of you or does hurtful things like blabbing around the school however, she's not worth your heart or effort and I say move on.
You should feel confident that when you tell the person something in confidence that he or she won't go around school blabbing it to everyone.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.