Trying to find a book

[Sophie]

Can anyone help me? I read a book whilst at school and I really want to read it again the only problem is that I cant remember who it was by or what it was called. I have a feeling that the title of the book was a girls name but im not sure what. The story focused on one girl who starts chatting to a boy online after she becomes very distant from her friends after a while she meets this boy in person, he says that he works in a bank I think but at the end of the book we find out he does but only as a cleaner, anyways when she meets this boy he takes her to a secludes beach top where they have a picnic which he brings everything goes well however after the girl feels like something isnt right as she keeps having flash backs of when she went to meet this boy so she turns to a girl who int really a friend but someone she knows well the talk then they decide to go together to meet this boy and as a decoy the girl says her friend has come as shes a bird spotter ( or something like that) they decide to take a sip i the sea and as they do the boy takes his top off and revels a tatto- one of te things that shes seeing in the flash backs fast forward a bit the girl tells her parents everything at they go to the police and the boy gets arrseted etc and then one of the friends she grew distant from comes to see her to tell her that one of her other friend is moving away and she wants them all come back together but the girl isnt sure or something like that ... I know its not a very clear description so i appreciate all the help! ... Something to note is that I think one of the girls works in a fruit shop or something similar X