[Cron]

If you are in a committed relationship with her, you are obliged to tell her.

How would you feel if she slept with someone else? How would you feel if she didn't tell you and let that go on, potentially for years?

If you don't tell her you are a liar in addition to having been a cheat.

You did the deed and you need be willing to accept the consequences if you want to be a responsible and trust worthy human being.

If you don't have trust in a relationship you have nothing.

It isn't hard not to cheat. Yes, it isn't fun to say "no" to something you strongly want, but in the end that is all you have to do. People who say otherwise are trying to rationalize away their guilt or their disappointment with themselves.

Be a man. Take responsibility for your decision. You will feel better about yourself and you will be a better partner in the future....even if it isn't with this person.

You will also have more faith in your ability to control yourself which will have positive effects in every area of your life.