This kind of thinking was very dangerous and irresponsible. First of all, pushing her down the stairs was an extremely cruel and violent act that would cause her great harm. Secondly, leaving this world was not an effective way to solve the problem. Doing so would only bring more pain and misfortune to her and herself. In novels, this kind of behavior was often seen as a betrayal and an act of harm rather than a way to solve the problem. Instead, he should try to deal with this situation in a more mature and responsible way. For example, you can consider seeking help and support from others or trying to communicate with her honestly to let her understand your thoughts and feelings. If you can't get her consent, you can consider seeking legal or moral help to protect yourself and her rights.