Thanks everyone. I've turned down the volume on my "little voice" and put the encounter aside.
Strangely although it was so unexpected, natural and spontaneous, recon hasn't crossed my mind all day. One of the things my h said during his leaving was that he never "chose" me... that we met during a crisis period in his life and that meant he didn't consciously choose me. That didn't feel good after being together almost 10 years.
In any event, for any recon to be possible, he would have to choose and I would have to feel chosen, if willing. Five spontaneous minutes in a parking lot doesn't even come close.
