What do I do?

I met this younger guy a year ago and we became really good friends, I also pay him to provide some services for me. Anyway, I am married but I am in a sexless relationship because my husband won't have sex with me. Long story short, I've known this guy...

for about a year and he kept telling me he was interersted in me even though he knew I was married but unhappy. We went out with each other a couple of times and then this last time we got together and we ended up sleeping together, he has a girlfriend forgot to mention that. I felt really guilty afterwards and I wanted to know if what happened between us meant anything and he said not enough to change anything in my life. I was heartbroken, I feel used and I really havent seen him after that he left on vacation to visit family. I don't know what to do, and the thing is I have to seem him almost everyday. He acts like everything is ok between us and we should behave as if nothing happened between us. Should we? I would appreciate all comments.

He wanted casual sex and he got it. You need to cut your losses and shut that door... forget about him. If you have to see him every day, also act like nothing happened. He used you. In his defence, he may have also thought you just wanted sex, and not a romantic tie, and he maybe thought that because you were/are married, you won't be stalking him and asking him what he's thinking.

sound like a *** to me

forget all about it. and if you feel really guilty you should just bite your tounge and tell your husband, what you were feeling and why you did it. cause if he is a good man, then he would be happier that you told him. but if he wouldn't take it well find your most trusted friend and get it all off your chest. or if you don't even want to do that, then write it all down, and burn the sheet, consider that as getting rid of all of it. for good.
wish you the best with your situation.