I NEED SOME HELP

Hey Peeps,
Theres this guy at school that I like and well used to talk and then I gave him my phone number and he doesnt talk to me or anything like that anymore...and it's really sad cause I really like him and I donno what to do at all. I'm desparate guys can you please help...what do I do...is there anything I can do...or should I just let it go.