Unfortunately, Your boyfriend may be having a secret relationship with you, or he could be running from the law. He may be married, or in other relationships, or he may have secrets that his family might reveal to you, including other lovers, previous children that he doesn't support, or previous incarcerations. Noone needs to be that secretative for years unless they have big secrets to hide. Why not seek out someone who wants to let you into all of their life?