I'm having an affair with my co-worker / What should I do?

I'm married and have known my co-worker for 2 years. He asked me to go out with him for a drink once so I did just as friends. A couple weeks later we went out again. He was going to bring me home which was fine but went somewhere else and had sex. He knows I am in a bad relationship right now and he used that information to get me to sleep with him. Now it has been going on for 2 months and it is really taking a toll on me. I want to be with him all the time but when we talked he has said he doesn't have those feelings for me so I know where everything stands with him. The problem is I have to see him everyday at work and we try not to talk to each other so that people don't know what is going on. Every time I see him I like him all over again and can't get him off my mind. I keep telling myself that I am married so it shouldn't matter and I know I need to stop but when we see each other everyday this is really hard. I

I'm having an affair with my co-worker / What should I do?
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