It seems to be a rather common problem, or at least is in my experiences. I haven't really seen a long term relationship where it hasn't become a problem. A lot of people mistake that for love.
Love is something more precious and yet less fragile than that.
Infatuation is an emotional rollercoaster that people experience at the beginning of a serious relationship. Love is the tranquil glow that is somehow brighter than infatuation without causing all the burns. Love is about knowing one another through and through. About being able to say anything. About not feeling jealous when he goes out without you because you know that he'll come back.