Can a guy have a good friend that is a girl?

No. (If you're straight.) If you are a guy, you expect something in return from that girl. You have some sort of attraction to her, whether it's personality or looks, or the fact that you are so well bonded. a) If you are single, it's fine. Everyone needs some companionship sometimes... but to say she's "just a friend" is a just kidding yourself.. and no one believes it. b) If you are in a relationship, you are practically cheating. Spending time with this "girl" friend, sharing feelings, your thoughts, with her, is not being honest to your girlfriend. She should be the one you are sharing this side of you with... Your girlfriend is more willing to share her feelings with you, first, and choose spending time with you, first, over her friends. Don't be dishonest - either establish boundaries with this "girl" friend...or you need to decide which girl means more to you. ..