The rarity is the sudden epiphany or single turning point showing you with dramatic clarity that your marriage is over, although that does happen. Most relationships hover on a precipice for years before one party or the other finally decides it is time to jump, and coming to the decision isn't easy.
I loved the idea of recording. The idea of sound-on-sound-recording captured me as a young kid, and once I realized what it was I had an epiphany. Before I was even playing the guitar, I would create these lists of how I would record things and overdub them, like Led Zeppelin song, 'I could put this guitar on this track...' and so on.