A difficult movie to watch...but so is experiencing life with undiagnosed personality and emotional disorders. I think that's the point. Rachel keeps calling for everyone else not to be "weird," not realizing that she is the "yeast" that feeds these toxic relationships. The video she watches later in the film is a clue that in earlier days, before she has descended to her present state of poor social functioning, life did have some satisfying moments and relationships. Unfortunately she is unaware of her own pathology, and how it has contributed to development of pathology in her relationships with the two people closest to her. Elements of these characters exist in most of us because to some extent we often encounter persons with similar pathology, but do not recognize it as such, and in turn are affected by it in the reciprocity (or lack thereof) of the relationship. There is a hopeful note in the film as the two other characters seem to make some progress in separating themselves from this entanglement...which could set up a situation for Rachel to recognize where the real problem lies.
An excellent portrayal by all actors in the film. Insightful writing and directing to include countless nuances of the pathology and how it affects others in relationship. Every use of the camera had its purpose in telling this story. Highly recommend this film for all considering and working in the mental health field. It's often said that one way to recognize a borderline personality is the feeling that nothing is ever enough in attempts to relate to them. This film catches that very deftly.