Dude let me give you a piece of advise...
You are like in the sweet age of 18 ... far too early from my point of view to consider stuff like keepin her yar` whole life, even if shes a sizzzzzzling hottie...
Simple solution to your girl bitching around:
If u nail her then nail her properly with 150 % dedication instead of a average 50 % :geek: , then neither she runs away due to the missing lack of attention towards her nor will she be trippin` no more !!!
Keep that in mind at all times, It`ll help u a lot, of that I`m sure as a heart attack...