One opinion for people who have been dumped or have broken up a relationship recently or who have been rejected in anyway: (and sorry for my English)
Usually we have a level of self love and self respect that is more or less constant during time.
But when we fall in love we do two things: first, we expose ourselves to others, taking the risk, hoping that we will be loved no matter our flaws and problems. Second, we focus too much on the feedback we get from the others, we focus less on our everyday life and activities and goals on life.
So when we get rejected or hurt: we don´t filter bad opinions or hurting rejections, these get straight to our selfsteem. As we are focusing a lot on these people´s opinions, we lost perspective, we no longer realize that our lives are full of many, many things apart from these people we love. We forget about our activities and our lives. We feel that these people knew all about ourselves and knew the real truth.
As a conclusion, our level of selfsteem and self respect falls dramatically. Our fears come alive. Like our fear of being ugly or bad or not a good company or a failure in life or a small thing in the universe.
Fight to get out of that shit and let your selfsteem and respect get high again. It will do it anyway, but fight so it happens faster. Do the things you used to do again. That´s that. Remember that this is a dramatic moment. The emptyness moment. Don´t forget that a lot of people out there need you.
People need people, remember that. You won´t get lost as a nobody.