Moving on after an affair?

I had a 4 1/2 year relationship with a married man and, I too am married with three children, he has none. I had to finally break it off. I was continuing to fall into a sink hole and not getting out. This affair affected my job, finances, mood.. I felt like the worlds biggest fool. My kids, my husband and me. I am not in a happy marriage, you know the same old sad story but I really am not. Instead of seeking a counselor or a lawyer I fell for a cute man who made me feel like someone. It sickens me to share my pathetic story but non the less I did have the affair. My question is will I get over this man? Why do I wonder in the back of my head if we could have made it. I am successful and finishing my Masters. You would think I would have a little more since but, guess what...I became a statistic.