About sincerety? How would you know that the person is sincere?

Love Because of love, we feel happy. Because of love, we feel that we are the most precious girl in the world. But, because of love our life now is miserable. Love can conquer but it can also destroy. It just depend only on how you handle things, how you manage your thoughts and doings.When you loved someone don't give everything you have so that he/she leave you are not much hurt and there's something left to you..

Is it life is boring without special someone or love life?