I reconnected with my 1st gf a few years ago. I was nice having some closure and understanding just what had happened. We had broken up kind of abruptly and I moved countries soon after and lost contact. I had many questions that remained unanswered for decades, and it was nice finally knowing the answers. At around the same time I also reconnected with my best friend at that time, but then I realize how much people change.
In short, I appreciate having the opportunity to reconnect, but then I realized that I was better to leave things in the past. What we *really* want is not reconnecting with our old friends, but "going back in time" and experience the good things we experienced in our younger years, and that is just not possible.