There is no good girl... no matter how much innocence she may display, no matter how faultless she may appear, never assume she is different from others. They are all manipulative.
Doing that means you are letting your guards down and you would be in for a rude awakening. You may like her, love her, hide whatever you feel for her as much as you can. Show it sparingly and then disappear from her sight for as long as you can. Appear again and disappear. Never let her understand you, be invisible.
Even if she acts like she is liking you do not give her the chance. Assuming she is different from any other will be your greatest undoing.
Act like you do not trust her even if you do, let her know you have varieties to choose from... ball hard, baff up and make her wish she was yours... but keep your distance for as much as you can.
There is no good girl, they all manipulative and confused, even the ones that will comment here know this.