In America, it's a different story, you can start over if this happens to you. When we fail to come through for friends, they don't necessarily let out a beeping sound to let us know. On the contrary, when we neglect our friends, many times they don't say a word because the message they get from us is that we don't have the time or energy to worry about their problems. Sometimes we forget the privilege we have to be able to relate to other people and form friendships. Look at the relationships in your life.
College is full of decisions.
We have to decide on classes, where to live, what field to study and with whom to form relationships. Unfortunately, those choices are usually dealt with in that order, which is ironic when we consider that the only decision of real lasting value is the one we put so low on our priority lists. You'll send that card to your friends, many of whom will be friends that you met in college.