Dear A Past Love,

Dear Nobody,
I am going through a period in my life when I have been thinking about an ex-boyfriend. It all started one day at work: I was finishing up and decided to Google myself. I found one of those websites that tells me my age and where I've lived. Then I decided to look him up on the site. It showed his typical age, the states he's lived in, and I noticed he's currently living only 6 hours away from me.
It has been 16 years since I last saw or spoke to him. He was just my first everything in my early 20s-love, a relationship, and even someone who wanted to marry me.
(I am happily married to an amazing man, and he is my everything.) I am caught up in this "what if".
What is he like today, what job does he have, is he married with kids or if he ever thinks of me? Is this some seasonal depression? Does this happen to others?