<p>I’ve seen this to be especially true if you became friends through your dorm or through a class. Friendships based on proximity tend to dissolve when you no longer live down the hall from each other or see each other in class all the time, unless both people make a concerted effort to stay in contact – and sometimes even then. A lot of freshmen make friends with their neighbors in the dorms because it’s convenient, but don’t actually have a lot in common with those people. Once everyone’s moved out, everyone also has a tendency to move on.</p>
<p>That said, you almost definitely will stay in touch with at least some of your friends from freshman year. You’ll probably lose a few friends, too, but will make new ones as well, so it all kind of balances out. I wouldn’t worry too much about it.</p>