You are the only love of my life.
You are the unique love of my life.
You are the only love in my whole life.
You are my only love in this lifetime写情书啊？！
you are the love of my life.
of my life就有唯一的含义了，个人感觉不用加only
You are the love of my life.
参考地址：http://baike.baidu.com/view/1444540.htm
You are the apple of my eye.
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