I almost forgot....
I ran into the third ex. She wasn't one of the ones I posted. She went even further back. An old high school girlfriend we'll call 'Carol' was at my friend's birthday party last weekend. I didn't even get to talk to her as she didn't recognize me but it definitely counts as the third. The major positive to come out of this relationship was the understanding that a 1983 Volvo is one of the worst make-out cars available to mankind (possibly surpassed only by the 1967 species of Volvo). True.
So. Now what will be the next sequence of threes? Old friends? Medical emergencies? Billing disputes? Snake bites?