Given that most people don't want to be seen as the villain in their own stories, I think that you are probably being vague about this “kinda vague” result to the exclusivity talk. You know damn well that she will be hurt.
So two choices;
tell her and let the chips fall where they may.
If there is no chance of her ever finding out, suck it up, and never tell another soul what you've done and hope she never finds out.
I'm so sorry Op. I don't understand why so many marriages are lost through infidelity. No loyalty, no nothing!
Given that most people don't want to be seen as the villain in their own stories, I think that you are probably being vague about this “kinda vague” result to the exclusivity talk. You know damn well that she will be hurt.
So two choices;
tell her and let the chips fall where they may.
If there is no chance of her ever finding out, suck it up, and never tell another soul what you've done and hope she never finds out.
I hate that nowadays people shame on having a heart and feelings.