My situation seems similar to yours in some respects, mine was very distant one day, and then texting constantly the next. My only interpretation is that at the time, they don't know what they want.. kind of like, they want to have it both ways.. I suppose it is similar to those who have been dumped, some days are good, and some days are bad. Having been in each others lives for a long time, there are bound to be things that remind both parties of each other, and influence whether the day will be a happy day or a sad day, if you see what I mean? I knew in my heart that he loved me, I don't know how, but I just knew it, and I think ultimately for me, it was the time spent apart to really evaluate the relationship, and its positives and negatives, that really made us both realise how important we were to each other.
I guess the most important thing is to wait and see, I know it's the hardest thing not knowing, and the 'i don't know' responses to every question get incredibly frustrating. Ultimately though, they will know what they want one day, and the NC period is good to give both parties time to know what they want.