Can a guy have a female bestfriend?

Do you think its possible for a man to have a female best friend and it be strictly platonic?.. this guy i'm talking to just sprung this up on me when she called him... he said oh thats my best friend , answered the phone. However, the convo seemed quite weird. I quickly questioned him as to who she was. Can't like i got very jealous and questioned if it was his girlfriend, since that same situation has happened to me before. I sent him a text apologizing for how I reacted..

But do you think its possible for a guy to have a platonic female best friend?