When to let it go?

I have real difficulty letting go of things...trying to find balance.

At what point do I stop trying to pursue a relationship that has been grossly one-sided? I'm not angry anymore....hurt? Yea it still hurts. I'm not even sure if hurt is what best describes it all though...there is a longing. The problem though is that the longing is for what was and it is for a person that at this point in time just doesn't exist. It's for the person I knew...I miss her still. There is part of me that has an expectation (hope maybe?) that one day it will suddenly return to the way things were...before things changed. I don't understand what that change was!! How does someone go from hands down the closest person in my life...the person I was most vulnerable with, the person I trusted more than anyone I ever have. And now our relationship has become the infrequent and self initiated text because I don't want her to think I don't care...cause I do...but I've learned I can't be there or be involved in a person's life anymore than they will allow. I haven't seen her in months and no more than a few word text exchange to account for either. I'm ok...I know I'm loved by many in my life, but there is still that longing for the relationship I feel like is lost and wonder if I'll ever have the chance to have that again with her. Or if we will just live separate lives as polite observers. I can't just stop caring about her...or her family...since I was 18 they were my family....and somehow I've lost them. I refuse to let the enemy convince me of anything. But at times, even now it elicits a strong response. I don't understand. It's out of my control....I can't make anyone change and certainly can't make them care. As much as I'd like to, I can't. Have I mentioned God is teaching me a lot??

Though she does not define me and know I will walk forward strong regardless of circumstances, that family greatly shaped me into who I am...all I know to do is to walk forward and focus on what God is preparing ahead and be obedient in anything He asks of me...its only a few days till Alaska...I'm ready to go, serve, grow, and invest. And hopefully gain a fresh perspective on everything that has happened.