I'm not entirely sure what your question is, but the following sentence is perfectly acceptable if you want to refer to what your life is like now : If I had met you before, my life would be different. That sentence also suggests to me that the two people have just met. --------------------------- If you want to refer to the way your life has been up to now ( or to the way your life was up until the time you met the person), then you can say this: If I had met you before, my life would have been different.
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