It's the rare person who can say that they knew so-and-so and knew how you were during that time. Very few who have been able to stick it out with you or who have amazing memories to be able to accurately go back and report on that person you were.
I think that is why we seek out our past relationships. It is some kind of validation, expression; some kind of yearning talk to the people who knew us as we were: young, vulnerable, unsure, misguided, angry, naive. Whatever we were, I think we long for some kind of testimonial; some right of passion, some kind of badge of honor that only members of our past lives can bestow.
Why else would school reunions be so popular? You get to go back in time, seek out those who saw you and knew you a particular, heartbreaking way, and you get to disrupt that memory. You show up in your finest - looking and feeling confident and mature and ready to take on the world.
It's interesting to me that social media is helping us save some of those memories. In an unfiltered, un-doctored way -- from the perspective of a lot more people than just a few chosen people.
We live in interesting times.