Even without the ending you can see a mile away, the boyfriend is an AWFUL person, and his girlfriend Lee (played by Linda Blair) is an utterly moronic, codependent doormat. Lee sees blaring red warning signs in literally the first minute she meets him, but she's apparently so desperate for a man that nothing matters even as he gets worse and worse and it gets to the point where she questions his guilt and she acts in an unlawful way to help him. There's NO explanation for her stupidity or her willingness to stay, as there is no character development whatsoever. Even the final choice in the movie is utterly selfish and possibly unlawful, hinting that the lack of character development is absolute. I don't know if this was Linda Blair trying to distance herself from being a child actor, but that's what the film came across as given the utter lack of depth to her character and the fact she just wants to keep having sex (he's a "minute man," btw, so what's all the fuss?) with her selfish, cheating, criminal boyfriend she suspects of being a serial killer. AND there is NO justification for her to give up her life and her business (!!!) and claim to love him--she even claims it right after saying that she doesn't know anything about him and his family! Good grief!
This movie irritated me. Everything about it was unpleasant and dumb. If you want to watch a film about how stupid women met obvious red flags before the existence of dating apps (I imagine she met him through the MadTV tape dating service, Lowered Expectations), then this is the film for you!
S/N: He keeps littering with gusto throughout the film, usually alcohol-based containers like bottles and cans, even off of her apartment balcony. That's annoying enough to be a red flag that he's an inconsiderate slob.