You know when you feel very strongly about someone and suddenly, many years later, you come to the realization that they don't feel the same way about you? It hurts. Especially when you suspect that their failure to return your feelings is related to the influence of someone new. But there is nothing you can do about it and you know that you would never hurt them by confronting them with it, so you just cry a little in the parking lot of the Home Depot and try to get on with your life.