What Not to Do
Don't tell your partner how to feel. It's only normal for the person cheated on to feel angry or depressed. Don't make him feel like the bad guy for being upset about what happened. He lost his trust in you and is angry about that.
Remember, you're the one that made the decision to cheat. Don't get mad at him for being angry. It's only understandable in this situation. Give it time and he will feel better.
Don't deny what happened or place the blame on your partner. Lying about what happened will only make things worse. Come clean with the details and assure your man that it will never happen again. You also don't want to blame him for what happened. It's important that you show some accountability.
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He did not force you to sleep with another man. If problems in the relationship caused you to cheat, then you still need to take responsibility.
If you want to continue the relationship but your partner doesn't want to, don't resort to violence or revenge. Your cheating has already caused enough problems in the relationship and getting nasty will make him resent you even more. It's his right to discontinue the relationship, considering the circumstances.