What should I do with my boyfriend?

Well my boyfriend told me that he was scared of a girl named ariel because she likes him. I went on facebook and Ariel told me that Sean(my bf) told her last nite that he might break up with me for her. She told me that she likes him too! My boyfriend didn't say anything about that today though. I think Ariel is tellin the truth. Can you tell me wat I should do?