Head Over Heels (2001) on Netflix

Amanda has not had the best luck with men. Recently she went home and found her boyfriend "with" another woman. She moves out and moves in with four models, who when they are not modeling, are partying. She also bumps into a guy named Jim whom she is attracted to but is unwilling to pursue out of fear that he will either dump her for someone better or has some quirk. And it doesn't help that his apartment is right across from her and she spends her time staring at him. When he asks her out, she decides to take a chance but one night while watching him she sees him kill someone. She then calls the police who cannot find anything. She decides to follow him to find out what he did with the body.