La Belle Dame Sans Merci

You discover something that you think you really like. You don't really understand it, but you're sure it's the best thing thats ever happened to you. You are thrilled. You focus on it. You give into the beauty and richness and pleasure, and let it overwhelm you.

Then the pleasure is gone. Far more than a normal letdown, the experience has left you crippled emotionally. At least for a while, you don't talk about regretting the experience. And it remains an important part of who you feel you are.