so i like this guy..

there’s this guy in my year group. i sit next to him in one of my classes and we always talk and laugh. so lately i’ve realised that i likes him, so i told two of my closest friends.. at the time! one of those “friends” completely turned on me and accused me of bullying her when she was the one who was ignoring me and talking behind my back.. anyways we were having exams and my ex friend i guess is sitting in front of my crush, i sit next to him. she has been constantly trying to talk to him showing off her body to him etc.. she knows i like him and it makes me upset, what should i do ? i’m worried that if i tell my crush i like him he’ll say he doesn’t feel the same and it’ll be so embarrassing!! help !!