You can be upset with me for my opinions, but if you and your significant other don't at least discuss the difficulties which will surround your long-distance relationship then you may be destined to fail. They also can't see each other every weekend even if they want to. It is more complicated than that and distance keeps them apart unless they make specific plans to be together. They can apologize, but never take them back. Even from a long distance away, they begin to smother each other and the passion begins to escape from the relationship.
Human beings crave physical affection.
People miss the other person's smile, eye contact, scent, touch, kiss, touch, and most aspects of physical intimacy. No matter how much a couple tries, physical interaction cannot be replaced by a phone call, letter or cyber anything. After too long a period of time, we as human beings will begin to seek ways to meet our needs, wants and desires much closer to home. This does not have to be a conscious effort, as sometimes it happens almost by accident. We don't want to disappoint or hurt our significant other and feel extremely guilty when we do.