like this girl is lacking in self respect. someone who has trouble loving themselves will have trouble loving you. i would move on and find someone with self respect.
you already have doubt in your head about this person and it seems as though whatever happens she ends up with her ex.
as much as you want to help her, you can’t until she decides to help herself, which she is clearly not doing. take care of yourself and go find a girl who will appreciate how much you care. 