"I'm loneliest, when I'm happiest"

What is it that tells us when we end and others begin? Consciousness? Well, it is pretty freaky to think about it. Sometimes we want to be one with others, or some person. We want friends who know us inside out. Someone who knows exactly what we're feeling. People who love us like ourselves. That feeling of wholeness and belonging. And we do achieve it ever so often. But it keeps leaving us...
Why does it have to get lonely when we're so happy?
Maybe its better to reject that desire and not delve into its possibilities. Sometimes we just have to accept the things as they are. Because even if we do live forever, in which case we'll have to see dear ones die. Not so attractive. Life's good. Now. It is.