Best friend trouble: Should i tell her?

should i tell my best friend that i kinda have a crush on this guy (the one from my earlier questions) but she doesn't like him at all, he calls her names and she threats to beat him up, plus today she told me who she liked and honestly no one trusts me with secrets cos i'm a blabber mouth, i'm the only one she's told and i don't know if i should tell her i kinda like someone to and this is big for me cos i haven't liked anyone since year 6 (and i'm practically year 10 now, one week left of school), what should i do?