My boundary is a PA. Its that simple. I cheated on my ex-GF and i swore that I would not do that to anyone again, and that i did not want to go through the same pain that i inflicted on her. I am yet to apologise, but hope to find the courage one day (how does one actually do that?).
I came very close to experiencing that pain, an EA is very similar, but for me, it's not a deal-breaker, but a game-changer!
I need her to want to build trust, otherwise we will be back here - not words, but actions. I can only GAL whilst she's trying to do that.
Just cos things are going right, doesn't mean that they were always wrong.