can someone please help with the name of this movie?

At the start I'm sure It's a couple, boyfriend and girlfriend, and
there's this book involved if i can remember correctly. From what I
can remember, i think the boy kills himself? Then you see the girl
running down a hill/street to her uncles/grandads/fathers shop? She
says that someone was following her but when this woman checked there
was no one there. Anyway, she 'dies' in the back room of the shop. I'm
sure scissors were involved.

please please please help :(
Also, after the uncle or whoever sees the girl in the back of the shop
dead, he dies next.

So I think if you see the person dead youre next to die? I think this
is how it goes..
You're amazing, thank you so much