Here is one idea.
Humans have vivid imaginations and have been writing and acting out the perfect love story for centuries. In a story or a vision it's simplistic. Then television was invented and instead of writing those simple perfect love stories they made them into short movies.
Movies then brainwashed people into having expectations. Then capitalism and media and greed took advantage of that to sell junk to people along with this vision and story which reinforced the vision or fantasy or expectation.
After all these years, expectations are all built up about their perfect love or vision they have formed since they were little. The problem is, everyone has a different vision and they all think it's more simple than it is.
Then if that vision isn't found in reality they are quick to give up without any effort or understanding that real life is more complicated than the movies or fantasies.
