Having a guy who has no guy friends often can indicate that he doesnt have any real friends at all and thats usually a bold red flag.

What does it mean when a guy has no friends?

A man who has no friends may be socially anxious, lacking social skills, or naturally introverted, says psychologist Irene Levine in the Psychology Today column Why Would Someone Have No Friends? A man with social anxiety fears being embarrassed in front of others or that he will be negatively judged.