Rosalie Cullen

She is the darkest in the movie and mean and nasty to bella and i love that cause i am not a big fan of her sorry but yeah she is so scared that her family will be injeopardy that bella will tell someone but Rosalie doesn't trust Bella i wouldn't trust anyone who knew the secret either so i agree with Rosalie too. I mean who wouldn't really. So you will need to find out more about that in the movies and the books but read the books first you would know better.