I had a emotional relationship with a guy for nine months we both have partners. He broke it off and is now moving on I really miss him and want him back completely. How do I get him back so its just me and him. I am so down and sad at the moment I don't know what to do

So what is it you expect?
You get a divorce/break-up and expect him to get one too?
He left you because, most probably, he felt guilty and wanted to work things out and make things right with his wife. So why would you want to totally uproot everybody's lives to have a wish that only you seem to want? Be happy for him and work out your own relationship.

You two cheaters probably deserve each other, but he may not want you back. Why should he? I think you fell deeper than he did, and either break up with your b/f, or tell him the truth, because this whole thing is unfair to him.

two cheaters probably deserve each other, but he may not want you back. Why should he?? I think you fell deeper than he did, I agree. I wonder how often somebody leaves their relationship expecting the other to leave theirs and they don't. Then the one that left is left alone.

Move on and try to get over the relationship. If you two both have partners, then it is for the best really. Try to stay as busy as possible, so you aren't thinking of him. Take a class, join a club, go out with friends, whatever it takes to keep your mind off him. Maybe counseling might help you reconnect with your partner. Try to figure out what it was that made you want to spend time with this other guy instead of your partner. Did he listen to you more than your partner, was he funnier, more compassionate to you? Once you figure out what you saw in him that your partner was lacking, then the two of you can try to work on that part of your relationship. Like if you felt that you could talk to this guy more easily than you could with your partner, then you two might want to work on your communication, etc. Seeing a counselor can help with this, and so could a self-help relationship workbook for couples.