Professor X is the core of the X-Men. Charles Xavier's dream of peaceful coexistence between mutants and humanity created them, and Professor X served as the group's mentor for years. During that time, Xavier was known for keeping his own counsel, and for many years, this made sense. The original X-Men were all teenagers. As the only adult, Xavier made the hard choices they couldn't. However, this kicked off a disturbing pattern for Earth's mightiest telepath.
Source：https://www.cbr.com/worst-secrets-professor-xavier-xmen-marvel-comics/
