I think more information would be needed to give better advice, but perhaps it could be the result of the "honeymoon stage" ending. The honeymoon stage is when you are both so newly in love that you can't help but tell each other all the time and no matter how much time you spend together it is never enough. It's a fun stage, but (unfortunately) it's temporary. Because of that, some people go through a disillusionment period where they have to learn to cope with the realities of the relationship (i.e. your significant other having flaws, the inevitable fall into a daily routine/pattern, etc). If you can do this, I hear the intense happiness from the honeymoon stage will come back -- or at least you gain a more fulfilled sense of love for your significant other, knowing you have fought for each other and managed to stay together despite any obstacles. Like I said, I would need more information about your relationship, but perhaps this is the cause?
