First of all tell us the fault of your husband. What wrong he did with you? He has faith on you and you are cheating him. When your parents was forcing you for marriage then why you surrendered him? You have courage to cheat your husband but this courage disappeared when your parents were forcing you for marriage.
Excuses which you have given to hate your husband are not convincing one. I am not sure whether your new boy friend really loves you or he loves your body. In this point of time you have to decide whether you want to spend your life with your husband or not. If no then first confirm with your boy friend whether he is ready to marry you or not. If yes then give divorce.
Now time has come where you have to take decision about your life. See whatever you do in your life; life will also return you the same thing.