Because of the conflict, so quarrels, so estrangement.
Especially some long-distance relationship, with the passage of time, will feel more and more suspicion. Because each other is not around, there will be a lot of ideas, a lot of things although a hug can be solved, but eventually turned into quarrels, cold war.
The feelings will also slowly fade, feel each other is no longer once each other. The fact is that the most important thing is that you have to be able to get the most out of your life, and you have to be able to get the most out of your life, and you have to be able to get the most out of your life.
Together for a long time, will slowly find the difference between the two people, the difference in outlook, the difference in the way of handling. You will find that he is not as perfect as you think. Naturally, you will be able to compare and contrast with the couples around you, and feel that people's boyfriends ask their girlfriends how they are so good at what they do, but it's a very different story.
With the passage of time, you will find that the other side does not love you so much, then the kind of passion no longer exists, instead of a dull life. And you want that kind of passion, are no longer exist, will produce a certain psychological gap, then the feelings between the two of you will change.