Everyone thought they would be friends for decades, forever. But for most people, of course, that hadn't happened. As you got older, you realized that the qualities you valued in the people you slept with or dated weren't necessarily the ones you wanted to live with, or be with, or plod through your days with. If you were smart, and if you were lucky, you learned this and accepted this. You figured out what was most important to you and you looked for it, and you learned to be realistic.