It can be platonic, familial, romantic, anything.
I’ll start: I recently moved in with my boyfriend, who lives with his wife and their son. They were already separated when we met, but his wife doesn’t want to divorce or move out, and she wants their son to live with both of them. My boyfriend agreed to those terms.
So now I’ve found myself in a pretty unusual situation…
I met my wife 40 years ago simply from a casual message that I could have missed or ignored. The thing you have to remember is, it’s not that you had some destiny together that you almost lost out on, but that it’s simply how things worked out, and if you’re happy with it, it worked well.
See Tim Minchin’s “If I Didn’t Have You” song.