Why am I worried about my wife's past all of a sudden?

We are on our Valentines date and we started discussing how I wish we would have met when we were younger.

Then she mentioned a crush she had in high school on this guy that was a year older. She was somewhat close to him, but it never materialized into a relationship.

It just totally killed the mood. Now I am dwelling on it.

See, me and my wife met when we were ages 27 (her) and 29 (me). We never got to experience our youths together.

Why am I worried about my wife's past all of a sudden?
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