I have not. Though I have found many contenders there was always some obstacle. I.e., the person was already married or they were in another area of the country or they were substantially older / younger, they weren't into me.

So I believe it is possible to have a "one" but excessively hard.

Personally I feel that most of the stable marriages that I see are with the "one that works ok for most times". Sometimes I think "the one" / a person who makes you happy -- will simply be short lived. So I do think there might need to be a change in what you are looking for.