I wouldn't do it, Shinto. Even if she never cheats on you again, you'll always be paranoid. Then she'll get overly defensive about your well-founded paranoia, and she'll start leading you to belive that maybe she is cheating on you. It will only end badly. Just walk away.
You really think if you forgive her she will have any respect left for you ? She will know that she can do it again.
If you stay with her it's gonna be nothing more then trouble.
Make out with her, have fun then kick her out.