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Here's an article about the psychology of rekindled love...talks about the chemical reactions and hormones in the brain when you meet your first love, and how only you first love can give you that feeling. It has something to do with the development of the brain during the years when you usually fall in love for the first time (I guess late teens/early 20s). It's all theory of course, but it's interesting to get a scientific take on first loves and reunited loves.