How could you possibly measure the intensity of love between people? You can see loyalty, affection, honesty, how much help they give you, etc. You couldn't measure your emotion toward each other though, I don't think.
Often times, in long-term relationships, one partner becomes more dependent and needs more love. Sometimes, one partner is committed to the relationship more than the other. But obviously both are committed enough and love each other enough and can compromise enough to be in the relationship.
That being said, you may have some ways of displaying love that seem strange to the other partner. But that doesn't mean they love you less.