Your love affairs tend to start off well enough, but then they gradually or swiftly decline into something that's no fun for either you or your lover. Maybe the love and attraction start out strong but quickly wane into nothing or, worse, into disgust. Part of the problem is that you tend to be attracted to charmers -- people who put on a flirtatious, intriguing face when you're first getting to know them, but once they drop the facade, you find that they're much less sweet or noble or loyal than you dreamed they might be.
You have real needs and yearnings in love, which only makes it more heartbreaking that you haven't found the love you crave; that every time you think you've finally found it, it changes into something that falls short of your expectations. It's likely, though, that these changes happen inside you. You associate love with difficulty, or even pain; every time you get close to real intimacy, you start to focus on everything you think you're lacking instead of on all the wonderful things you're gaining from the experience. In order to have a more fulfilling love life, you may need to retrain yourself in terms of how you experience love.