How to get my sister to back off?

A week ago I met this guy named chris. I liked him from the beginning but all of a sudden I couldnt sleep because I was thinking of him. I really like him and I think he likes me too. The problem is my sister. She likes him too. I asked him about her and he said he didnt like her. The other day we were writing things on the sidewalk with chalk and he wrote I love rossy (my nickname). He sang the song 'same girl' to me. I was shocked. I don't know but just the way he says my name turns me on. it shouldnt because hes just someother guy and I wasnt sure that he liked me but his little brother told my little sis (theyre both going out) that he likes me. She asked him how he knew and he said that he overheard chris and his older brother talking.

I don't know what to do. My sister is always with him trying to get him to like her. She wont back off. She knows he doesnt like her so what do I do???

tell her to back off she has 2 come to temrs with him not likeing her an him likeing you!! you CANT! make somebody like you!, tell your siter to deal with it!! talk 2 her and tell her how much you like him, if this fails, I suggest you get this guy 2 tell her to her face that he doesnt like her inthat way!

tell her to leave him alone