so I have this friend and she has change everything about herself ever since we started high school. how she dresses, talks, acts and she's even starting starving herself just to be thinner. she used to be so fun to be around but now all she can talk about is how many guys that are interested in her. I really don't want to lose her because we have been friends for ages. so how can I tell her that she's completely different from what she used to be?