There is the old phrase "the bigger they are, the harder they fall". That might apply to our expectations in love. At least for us older folks.
We fell in love more easily when we were younger. We suffered our share of breakups along the way; so, as we got older, we lowered our expectations.
We don't expect to find someone who would be perfectly suited to us. At least not easily.
Because we learned about compromise, we know we will not find someone whose views and opinions match ours. Not exactly.
We expect that "all the good ones" are taken, so we have to settle for second best.
No, you are saying, this is not true. I agree. But we have grown a bit numb to the process.
And that's where we run into trouble.
We have learned to ignore our expectations. We won't consider fanciful expectations, until they look like more of a sure thing than they used to. We tend to ignore them until they go away. Unless we fall in love.
That is when all the blood drains from our brain and we again do stupid things, like daydreaming about a future as half of a loving couple, imagining our new sweetie pie being fawned over at family events, even envisioning that certain ceremony that unites two into one....
The deeper we fall, the less the brain works, the more hope takes over, and the bigger our expectations become.
Then reality strikes. The feet turn cold. The looming commitment is spurned. Our big expectations tumble.
And the bigger they are, the harder they fall....