Um How Do I Get Out Of This Situation!!?

Alright I am in 5th grade, I don't care if you think that's to young ( there is 6 year olds who know about sex!!) and I don't know why I did this. but to the guy i like i passed him a note and said it was from a secret someone, i said her name began with A and in another class and I told him i would tell him the last day of school but i was absent and he will remember next year in middle school and keep bugging me out (the notes were from me) i was going to say the girl i thought who would be okay but she is going to that school and i think he likes her and i know she likes him and i dont want them to be together cause' thats really young! ( my mom says its okay to have a schoolboy crush but not for a realtionship) i didnt tell no one about this what should i do?!