Sacred Haven of Debauchery

Wow, this is crazy. I decided to check out the profile page of a former classmate and see his (now) wife, who seemed familiar to me. I went there and recognized her as a classmate. But how? We only graduated last year, and I remember him dating another girl, and she also seemed to have someone. When did they get married? They just seemed to be casually chatting, like many others.