I think looking back at people from your high school has the attractiveness of a do-over. You know you have some commonality from having gone to high school together. There are couples from my high school class who have gotten together after their previous marriages ended. My thoughts since the bomb dropped have flitted over past boyfriends and it has been tempting to look them up on FB. One of my boyfriends from high school was unhappily single at the last reunion I went to, and we drank and talked for hours. While my M wasn't perfect then, I had no intention of taking that any further. Next time, who knows. This is just my personal evidence that it's understandable and possibly common for HS reunions to spark new romances.
It does sound like you're a little jealous - what business is it of yours if they got together and what the statistics say about their chances? People live, they get hurt, they experience happiness. What are you trying to accomplish in examining their relationship? Possibly you were hoping to explore one with him? I don't mean to be mean, just honest, because that is exactly what I would have been feeling.
My current thinking on past boyfriends is, their in the past for a reason. The future holds new people, and with the wisdom gained from your experience, looking forward can offer wonderful opportunities. Much better than looking backward and trying to recapture the past.
Adinva 51, S20, S18 M24 total 6/15/11-12/1/12 From IDLY to H moving out 9/15/15-3/7/17 From negotiating SA to final D at age 50 5/8/17-now: New relationship with an old friend __ Happiness is a warm puppy.