What is the truth love?

Someone say it is sweet like honey when falling in love, but nobody tell what is like when losing the love. When I was alone, I absolutely thought that I can deal with it, but I found I was wrong. Something have go inside your heart and left the marks, it seems like everything have changed .
I always feel that everything become strange when face-to-face the familiar environment. The cars in front of traffic light know where they will go, go straight, turn right or turn left. There always have a way to go, but I none. What I can do at that time only looking them by lonely myself.