Most Helpful Guy
High school drama. It's best if you stay away from her as much as possible, but treat her like you would anyone else when you can't stay away. She is after him, and she'll bad talk you, and make you out to be trash to try and get him away from you, but if he knows the truth, then it'll be egg on her face when it back fires. Don't worry, in many years from now, you'll see that it was all stupid games, and you can laugh about it.
Oh and it doesn't change outside of high school. Sometimes it gets worse, and other times it's hardly noticable.