what is love?

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Several days ago,my girlfriend asked me,"What do you think about love?"My answer is "I don't know".But she was't content with the answer.She asked," Do you love me truly" I usually answer "sure",but I had a bad mood that day.I said loudly,"You were boring,let me alone."She was very disappionted.I love her very much,and I don't want to hurt her,but I did.So,what is love,what is your opinion?