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You end it by just ending it. Are either of you married? Is he your boss? Do others know about it? Was he nice to you? The reason I ask is because your response will dictate how you should go about it.
If he or you are married, then just say it's over, leave me alone and look for another job asap. If he's your boss and you think he may not be happy about the break up, then maybe you should find another job first before saying anything. If he was nice to you but you're just not feeling the relationship and want out, then be as gentle as possible, but firm so that he knows to leave you alone. It's never easy, but if you don't think you are getting the same in return, and it's not something you can talk through, then it's time to leave.

It will hurt for a while, but then you got to get up and continue with your life or it will hurt a lot longer then a while.

How long's a piece of string? It will depend on your feelings for each other. As for how to go about it - be TOTALLY honest.
For many reasons:
To save face for him: people might know about it, and will ask him. It saves him being embarrassed wondering what people are saying about the breakup behind his back.
If you do run into him, you will have nothing to hide. You ended it because you wanted to. You don't even have to go into explanation on this one because there aren't really any "reasons" why people break up with each other. "this isn't really working for me any more" is kind of enough I think! Once you get into reasons, you're intellectualising something that is very feeling based.
Why do you want to end this anyway? Are you in another relationship/married? Do you want to continue working in the same place?

My apologies! I just realised you also wrote this post and it's connected to
https://www.askmehelpdesk.com/showthread.php?t=20280

So...
You don't need to tell him anything other than it's over, you've decided to work on your marriage and it's not good for you right now. You don't really owe him anything, so it's completely up to you. It might be worth considering changing jobs though, as you might feel akward there. Other than that, if you have to put up with the job and stay, keep it cool but amicable. That ensures smoother office politics. Break up with him outside of work, outside of bed. Somewhere completely neutral. Tell him you just want to move on, and let him carry on with family life. Tell him you developed feelings for him if you like, and it's gotten too complicated, so it's better to just leave it before you all go insane. It's totally up to you. Good luck xxx

I know its hard but as I said in my other post on the other thread your doing the right things! You need to look this dude in the EYES and tell him to stay the HELL out of your life our your going to tell his WIFE and your HUSBAND what has being going on... At a guess if you bite and make it sound like you mean it, he will stay well clear.

If you work for a large business is there a chance of maybe moving to another place to work?? Or maybe even thinking of getting a new job at a different place?? That would mean you would not have to see his sad *** anymore...

When you confront him you need to be very strong and keep your HEAD set to it's OVER!!

Ignore him and go about your own business he doesn't deserve an explanation just don't even look his way,good for you!

Just tell him it's over. Or don't tell him anything at all.

Next time he comes to you for sex, just say that you are no longer interested in it and leave it at that.

How long will it take you to get over him? Can't say as that really depends on you.

Hi,
Since another answer included your first question about a "sex-only" affair, I assume he thinks this is still going on between you two. If you are married, there is no such thing as a "sex-only" affair... there is a relationship here; otherwise, you wouldn't be asking how long this will take.
I've been married 29 yrs now, (divorced the 1st marriage after 7 yrs), and I personally don't believe in "affairs" of any kind, if one partner is married.
How do you tell him it's over? Just catch him at work, tell him it's over. Walk away.
If you see him again, just ignore him. It will take you some time to get over this, and please remember this affair. If you are married, please don't start another one... it's not fair to your relationship with your husband. I do wish you the very best of luck.