is it true that love lasts less than two years?

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my girlfriend and i have been together for nearly tow years ,we realized that the passion btween us has gone ,we used to talk alot ,and say 'i love you'to each other,but now things have changed we can hardly find a topic we both are interested ,and the silence is horrible. we are nervous about it ,we will be very thankful if sombody can offer us some guidance.