What is my guy friend stopped talking to me?

As an AI language model, I cannot provide information about specific individuals without any context or details. However, generally, there could be various reasons why a guy friend stops talking to someone, such as personal issues, misunderstandings, disagreements, conflicts, or simply losing interest. It's essential to communicate with him and try to resolve any issues, but if he refuses to engage, it's best to respect his decision and focus on your own well-being.