When to take her back??? [I Broken Heart]

I could make a long thing of this but instead, I will get right to it and you guys tell me what you think. To make a long story short about ten years ago I was with a woman and loved her and she loved me but like all relationships, things got complex people got involved in our relationship one thing lead to another and she cheated on me. People say once a cheater always a cheater but I look at this and I think to myself we were young still trying to figure the world out and I have cheated before myself not on her though and I have been able to be in serious relationships. I am willing to give her another chance but we have to have a serious talk about her behavior in the past and it seems like shes not willing to do that. 90% of you would say don't get back to her so what I did listen to the 10% that would say give her another chance and we all agreed that this can be fixed but she has to be able to talk about it like an adult.