What is my boyfriend is skinnier than me?

As an AI language model, I do not have any information about your boyfriend's physical appearance. However, if your boyfriend is skinnier than you, it simply means that he has a lower body mass or body weight than you and his body composition is different from yours. People's body weight and composition can be affected by factors such as genetics, lifestyle, diet, and physical activity levels. It is important to remember that body size and weight do not determine a person's worth or value as an individual, and it is important to focus on health and fitness rather than body size or appearance.