I must express a different opinion.
You're still carrying a torch for someone for the last 10 years. You haven't seen her in all that time and have only been in communication lately, am I reading your posts right?
Ten years is a very long time--no one is the same as they were 10 years ago. Think about where you were 10 years ago, what you wanted out of life, what plans you had (aside from her). Are they the same plans as they are now?
I'm 50 and what I wanted 10 years ago is not all of what I want now. Everyone changes over time. Not necessarily 180 degrees but I don't know very many people whose lives are a straight line. I see it more as, well, not a straight line. Not a curve, but a series of branches. You go down one path that seems interesting and it dries up so you try something else. That's what makes people so interesting--they evolve over time.
As far as this love-thing (and I'm not belittling your feelings, believe me) goes, there are many different kinds of love. I have a friend who I've known for almost 30 years (I met him at my first Real Job out of college) and have loved him for most of that time. He's married as am I (something I swore even into my 30s I would never do, particularly after an experience I describe below) and there isn't anything I wouldn't do for him, I value him that much. We now live 1000 miles apart and he's going through a very difficult time right now but if he needed me I'd get up there just as quickly as I could. I would never leave my husband for him and if he left his wife for me I would have to shake some sense into him.
When I was 18 I met someone who was my first "True Love" and thought he was The One. My sun, my moon, my stars. We were together for just over four years and had I married him I would have put a bullet through my head by now. I had a way different idea about what relationships were about back then--I slavishly devoted myself to him and after awhile it wasn't enough. He saw my lack of self-esteem as something to exploit and I let him do it in spades. I finally got up the courage to leave him (actually, the parting was mutual); back then I'd settle for a bad relationship (I let him emotionally abuse me) rather than be alone. How foolish I was, but I learned some very valuable lessons.
I guess I'm just not the romantic kind to say Go After Her. Instead I would say, Get Together and Take It Slowly. You might learn that she's not the person she was 10 years ago and you're not compatible (sp?) as you were back then, except as friends.
What kind of friend would leave another during a time of crisis? And never aplogized? And now comes back in? Did she ever apologize for deserting you when you most needed her? If I ever did that to anyone I would die before I faced them again I'd be so ashamed.
It doesn't sound as though you've pursued many other chances for relationships in all that tme. You may have missed out on some opportunities to, at the very least, make some new female friends. Friends of the opposite sex can sometimes be more helpful than those of your sex (again, I speak from experience).
Yes, you can love someone you may never be able to have for the rest of your life but, chances are, you've idealized that person to the point of having lost reality. I've had crushes on men (I still do but I don't act on them) that, once I get to know them, I realize that the attraction was based on a false premise.
So, what to do, what to do? If you feel that reconnecting is the way to go then try it. Keep an extremely open mind and expect that she will do the same. In the meantime, if you're in a situation where you can meet other people (men and women) and become friends then do it. If She isn't the person you that she was at least you'll have people to help you pick up the pieces. If things turn out well you'll have people to share your happiness.
Sorry for rambling--it's been a long day and it's past my bedtime (it's all of 8:20 p.m.).
Good luck and please keep posting.