bill89,
It is time you take something back from her.
Next time she "make use" of you again, hold her hand when you have
the chance to.
If she pulls it away, and refuse to let you get close to her, then
you know she is just making use of you.
Since she is making use of you, why would you need to keep such a
friend.
This kind of friendship you still value for what ?
Unless you are afraid she accepts your advances.
So, you really have nothing to lose here.