I got to thinking about this question in the wee hours of the morning, and I came to an interesting conclusion: we all have Ones. For instance, let me pull from a bit of my history:
The One who turned me into an absolute crazy person.
See? There's one. How about another:
The One who was so freakish and weird, I nearly contemplated suicide in an attempt to avoid him.
That's a long title, and seemingly difficult to live up to. I assure you, he had no trouble.
I should also point out that Ones can be several Ones. I will demonstrate:
The One with the very, very small penis was also the One who cheated. (makes sense)
See? Ones do not have to be mutally exclusive.
In all fairness, there are good Ones as well as bad Ones. Like the One who took care of me when I was sick. Maybe you have a One who inspired you to be a better person, or One you could talk to for hours.
You see, we all have Ones. Perhaps they're not all "great loves" but I'm sure we all thought them to be at one point.