Ther's a new guy in ma class and ihv seen him starin at me sumtms he has also tried to talk to me alone?

he ignores me infront of my and his frends. whenevr he passes by me he gives me a very sharp luk and he even smirked at me. whenevr i talk to any guy , he luks disapointed. irealyy dont want to take him in a negative way!!!! pls help