Amazing coincidence

From the Morrissey concert, I took the subway home. As I came down the escalator at my stop, someone waved in my direction. Eventually, I realized it was a friend I hadn't seen in years. What he told me next set my rationalist beliefs reeling:

• He'd attended the same concert, with his girlfriend.
• She had asked him how he knew Morrissey. He explained that I'd introduced him to it.
• She then said jokingly that he might meet me at the concert, but he laughed it off.
• He works behind the subway station; I live in front of the subway station.