IF you want him back you need to be humble and truely sorry and ask for forgiveness. YOU HAVE to break it off NOW. You can't have both.
Since you posted this in the prayer forum I would suggest, no urge you, to get on your knees and beg forgivness from the Lord. Open up your heart and mind and life to him. You need to be humble and then when you hit rock bottom only then can true change happen.
Your husband is hurt and needs to see that you are willing to change. Have you consitered the problems you are having with him may be something that you may not be able to see because you are focused on yourself. I could never see the pain inside my husband because I was to focused on myself. He then had a mental breakdown, left the house, moved in with his mom and treated me horrid. Only when I thought I had really lost him and humbled myself did I truely have the power to change my situation and only was I able to do that through the Lord. Whew! That came out so preachy and as a new Christian that is so different for me! I pray that you have the love for your husband to break this hurtful relationship off.