We fall in love with one version of someone and we expect them to stay that way, but they never do.
I went through a phase when I was 13 where I would only fall in love with people over the age of 19 or 20. I never had a real relationship with any of these people, but it was definitely the guy I wanted to hang out with and wanted to go on trips with. I would be like, 'But, Daddy, he's a musician!'.
Oh God, to think that you only fall in love once in your entire life is such a depressing thought.