The only movie I can think of is Girl Interrupted. I'm not sure whether I trust the protagonist's view of things that happen. My Mum has mental health issues, possibly scizophrenic. There was something familiar in this movie in the array of characters, not so much the protagonist. I am familiar with living with someone who doesn't see the world how it is. I need to read the real biography it was based on. The girl was diagnosed with borderline personality disorder.
Do you like to read novels? I read In the Woods, but Tana French and that really irritated me on the first read through, but the more I thought about it I realised that it was an unusual book. Normally you are meant to trust the narrator to tell you the real story. Normally a novel unfolds and tells you the truth of that story. You get a satisfying murder mystery ending where you find out who did it.
In this book, you are never directly told what happened. I was like, what's the point of that! I was so irritated I had spent hours reading this with no answer to the mystery.
But you are not meant to know if he is truthful or not. I read a few reviews and it finally clicked with me. You are not to trust the protagonist. You have to read between the lines.
https://www.amazon.co.uk/Woods-Dublin-Anthony-Macavity-Clarion/dp/1444758349