It's a matter of self-respect now. If you go back with her, she will have stripped it from you. If it was true love, and meant to be, she would of never cheated on you in the first place. At least don't let her take your dignity. End it in your mind and it will help you. You may even find some release. At the same time, if you truely do this, she will see it and it will eat at her. Don't let that bother you, she deserves it. The second you give in, you're her ragdoll and you have no more dignity. You're in charge of your life now. Utilize your new found freedom to do what's best for you.