I like this movie .I believe it teaches people what not to do in a relationship as both Tom and summer if you don't want to get your heart broken or hurt someone respectively. Also,that don't expect someone not to fall for you just cause you told them that you don't want a serious relationship. I think If you don't want a commitment than go hire a sex worker or just be friends with someone. Everyone have feelings and you might not know how hard the other person might fall for you. Just saying in the beginning that I don't want anything serious doesn't makes it not your fault/responsibility. If you're engaging in a romantic relationship with someone,there is always high chances that the other person will fall for you.