My sisters crying the day away

My sister has been having doubts about her and her boyfriend for a couple of weeks now. Today she rang him and he said that somthing was up to do with him but is refusing to say what untill tomorrow which is our first day back at school.

This has made my sister really upset and worried. Then she went on facebook and a girl was asking chris what they where doing on sat making my sister even more uhappy.

Im soooo worried bout my sis now as in the past she has dealt with boyfriend problems by making herslef sick.

Shes been depressed and insurcure for month and now this has happened.
PLus im the only person she can talk to as mum and dad dont take her feelings seriosly ..thanks to me..

I cant help her im too messed up myself
I dont know what to do.
LIZ