There are lots of reasons that every guys have a girl bestie.
1. Be in a relationship problem or a career problem, nobody else will give you an advice as great as your girl bestie. She knows you better , probably even better than your girlfriend and definitely knows what's best for you.
2. She is always ready to go shopping with you. She knows what looks the best on you.
3. You always have a date for hangout anywhere.
4. You have done all kind of crazy stuff together that you cannot even imagine doing with your guy friends!
5. She can help you to get out of the classroom by talking with you in front of teacher to save you from boring lectures and would help you cheat in the exams.
6. There always have someone you can depend more than anyone when you need a shoulder to cry on.
7. You can make jokes on teachers and her crush with her she won't give a shit and say bravooooo.