The Guilt Of Cheating [#THESCENARIO]

Tonight's scenario comes from a female listener:

“So here my story. I have been with this guy for 3 years. Like any relationship we have had our share of ups and downs. I have caught him up in several different situations over the time we have been together and I have had enough. I decided that I would find me another friend (male) because he hasn’t showed me he is going to do right. Last weekend I hooked up with my new guy, went to Atlanta and spent the night. This was the first time I had stayed away from home since we have been together. I haven’t slept at all since that Saturday night. I thought that I was getting some kind of revenge on him but now I feel horrible. I need to know how can I make myself feel better about what I did. I know telling him is not an option. I know I cannot see this guy again because I feel so guilty. I don’t want to break off my relationship of 3 years. Help me please”
Signed,
Revenge Doesn’t Work

What advice would you give this woman ?????