Many people make close friends at university, even without intentionally doing so. There's a common, yet erroneous, pattern of thinking in many "successful" people where they attribute their actions to their success without considering that they may have still been successful had they chosen different actions. In this case, the author may have still formed closed friendships had they not chosen to do so intentionally, as many other students do. The only way to really know would be to have the author clone themselves twice and have each clone go through school with one intentionally seeking out close friends and the other not.