I am involved in a physical affair with my Boss. What should I do?

This affair has been continuing for some months now.Can I keep this affair secret or such affairs are sure to get out in the open?My Boss had made it clear from the very first day that he is not in love with me and that he wants me out of fun and novelty.But I love him and keep going to him all the time.We have and he thinks that I too go to his room for only.He doesn't believe that I am in love with him.This hurts me a lot.I am really in a fix now as neither I feel like letting him go as I love him too much and at the same time I do not want to be treated as a fun piece too.Can anyone help me what to do in such a situation?I am unable to concentrate on my work and really unhappy.My personal life with my husband is getting affected too but I am not able to help myself.How can I make my Boss see that I love him.He never calls me but when I go to him we end up having .Now a days he has started remaining aloof too.I am really hurt.Please help.