Betrayal/Moral Conflict

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Hi, Ok here goes. Almost 2 years ago my sister told me she had slept with my kids dad in the basement while we were sleep upstairs. She was temporarily staying with us at the time. Now I appreciated her finally telling me this even though it was at least 10 months later, she had left and was situated, and pretty much I didn't need anymore bad news! I love her but could never really trust her again. He's never admitted to it but that doesn't truely matter. What matters is that we had our problems anyway and I feel that we would have had to end the relationship in that way sooner or later. I'm still in contact with him and I gave up the house only to end the living together situation. I ended up staying with her and because he's still in my life, altercations have happened between them that is now forcing me to just leave him alone period. My question is am I wrong for thinking that this act has caused certain things to happen that would not have happened and I'm being forced to make the right decision even though I feel in my heart that we could have been on good terms or am I suppose to feel that this drama being caused in my life is solely his fault and not be angry at my sister for what she did?