What should i do?!?!?!?!?!?!?

my friend i used 2 like just gave me a necklace and i don't like him back. i like his best friend jameson. he thinks i like him because i never told him i don't anymore. may 29th is my last day in school & i think i'm going to tell him then. but i don't think i can wait any longer. what should i do?