Look,
Just act normal and be a friend. Stop looking for somethng that isn't there. It cannot be if she has a botfriend? Right? Enough already.
What is clear is that you do not suffer depression. You haven't mentioned it, symptoms, doctors, therapists, meds, anything depression related since you used the words "depression" and "Suicidal" in your post. My belief is that was atention seeking else depression would be your problem, not some girl.
Just leave off mate. Go see a counsellor or something and ask about the eating disorder that is apparent if you still thnk you're fat. That's exactly the behaviour of those with bulimia.
This forum is for depression. Actually having and suffering it unfortunately. I think you have misused the terms for attention. Shame.