I am a nice guy, and my girlfriend and other friends and teachers know it too, but how do you be a good BOYFRIEND? Freaking out here!

In Middle School, relationships are mostly very transitional especially as you get close to High School. Continue doing and acting as you are acting, it already seems everyone including your girlfriend thinks is good. However, a good booyfriend, at your age or older, should have some key points. Be yourself, do not lie, listen to her, try being her friend as much as her boyfriend, do not be jealous, earn her trust by your trusting her. At the end just enjoy your time with her and don't try over analyzing things too much.

Go with the flow and have fun, enjoy your Middle School years.

One thing would be DO NOT give her your passwords to ANYthing, and DO NOT ask her for hers.

(You noticed the capitals, right?)