Unrequited love makes sense to the person who longs for someone who does not love them in return. It can happen to anyone. Hollywood stars are often the targets of unrequited love. However, when it becomes obsessive, the danger is that people can start to feel that that they can only become complete and fulfilled through being with the object of their longing. Or some people feel without that union, their life loses all meaning. Once that happens, the likelihood of depression becomes greater and that's not healthy in anyone's book.