Everyone has their own future employment direction, so they will get on well with those who can help themselves, and some people will only get on well with those who can help themselves. It's not easy to find a real friend who can talk all night.
And love. Many people will find someone in college, but they don't really like it. They will also weigh the pros and cons, have a purpose, especially seniors, will take junior as prey, and rarely have real love.