In rare occasions, I have seen a marriage come back stronger after infidelity but it takes a lot of work from both sides. If you are not married and this is happening, I would not take it any farther. Cheating on a cheater? I would not change my character to get back at anyone and do you really want to invest precious time with someone that you want to get back at?
Apply this same question in any other life situation and the answer is going to be no.
If someone hit your car, would you backing into their car make it better?
If some woman fought with you, would fighting with her the next time you saw her improve your relationship? Could you ever be best friends?
If a dog bit you, would biting it back fix the situation?