We like to think of these things as clear decisions. But even when we first meet someone, we take a long time of getting close, then keeping some distance, etc., over months and years before we get to where we can commit for life (and even then, well, we all know how THAT goes).
Like many things, important decisions are also a process, not an event.
You keep using that word. I do not think it means what you think it means. -- Inigo Montoya, 'The Princess Bride'