Every time I broke up I was mildly welcoming some time for myself but never managed to be single more than a handful of weeks. And I don't consider myself particularly more attractive/interesting than everybody out there.
Perhaps I am reading too deep, but you make it sound like someone needs to make some great effort to meet someone else. No, just a slight hiccup in their daily routine can introduce them to another person whom has very similar, low energy interests. Think: Buzzfeed dating videos from 5 years ago.
Really? Tell me where these people are! The vast, vast majority of couples I know just coast through life and sometimes they "hang out" and sometimes they take some photo and sometimes they partecipate in some friend's celebrations and so on and on. If they asked each other about their interest they would not have any.