Help me!!

Okay, so I’ve been friends (crushing) on this kid for awhile. I’m 13 and he’s turning 17 this year. We both have feelings for each other and he’s always talking abt going on dates. My grandma would kill me if she knew about him, but I hate keeping it from her because I just want to brag abt him constantly! He’s absolutely amazing! Should I tell her or not? If so how should I tell her?

also, we facetime a lot, text a lot, and are talking to each other at school