Nope, we didn't have sex together while in the "gray" zone. It's really a f*cking dilemma, things would be so much easier if she didn't love me anymore for instance - it would still suck, but at least my options would be clear. We spent two hours weighing pros and cons for us getting back together. I don't see us going anywhere, I don't see things getting better between us, there are like 200 reasons in the "con" list, and only one in the "pro": I really want this girl. It had been a very long time since I'd spoken to her in person, and the whole thing was ambiguous (like her playing with my hair, holding my hand, hugging), but we didn't kiss. When we were close up she wouldn't look me in the eye (or briefly), but I could see it was a big effort for her. Her whole body language was yelling "kiss me!!!". Getting back together is simply something that we cannot afford, and so is splitting up.
This might sound cliché, but for both of us, it's really "listen to your heart" or "listen to your head (and to logic)". Either way, the road ahead is really bumpy for both of us (it's pretty much always been anyway). I change my mind all the time, I don't know what I want. The chances of building a stable, working relationship are extremely slim.
@Manrevo: it's possible she's forgotten, as I've said, it had been a long time since I'd seen her in person.
So, call it quits, or give it another shot?