The harsh reality is that you didn’t cheat on him. When people break up they have to understand that they’re free and single. He’s having a hard time taking responsibility for his part in the break up. Although you definitely didn’t do anything wrong, I wouldn’t have advised you to discuss the hook up during your break with him, but since a friend told him about it, it’s time for you to come clean. This is your opportunity to tell him you weren’t going to mention it because the two of you were broken up at the time, and because it’s not important to you in the way that he is. If he doesn’t have the maturity to get through this tough situation with you, then he’s not going to be able to weather other bumps in the road which will come along in any relationship — good or bad!
You’re letting your fear of his behavior dictate your own behavior. This isn’t a good dynamic. You can’t walk around reacting with fear to what he will or won’t do. The reality is that someone else told him about your hook up and there’s a chance he’ll learn the truth about it and you’ll be caught in a lie, which isn’t a good trust builder for any relationship. I know this is difficult, but because of your close knit group of friends, it’s a good idea to be honest with him.
Let me know how things go, and please follow me @AskAprilcom on Twitter and on Facebook at this link: [url][/url].