Why do guys get jealous when they see a girl they like with another guy. It may not be his girlfriend or wife, just a friend or a girl they know?

Anonymous
Why do guys get jealous when they see a girl they like with another guy. In this context I'm not referring to their girlfriend or wife but rather a female friend or a girl they know that they are attracted to. And if they are jealous to see her with another guy, why not have the guts to ask her out?
Why do guys get jealous when they see a girl they like with another guy. It may not be his girlfriend or wife, just a friend or a girl they know?
7 Opinion