After seeing the pain she caused you after the first "affair" she still went out and did this again? Whatever did she tell you after the first time you two discussed the transgression, that she would never do it again? Seems like she is telling you something here, and it isn't that you have a problem, it is her that has a problem taking a vow and keeping it. Wherever she goes from here, she will be looking for new "experiences" so feel sorry for the next victim as well. I have been in your spot, and it kept me on the sidelines for many years. Do not be like me, hoping she will change and come back and all is well. There are so many others out there that will respect you more and love you more. Any time wasted with a cheater is time taken away from the right soul mate you have not met yet. Good luck to you...