What actions she will demonstrate if she is truly remorseful? I will not trust her if she says "sorry" or "Can we start on being us again?" or any other variant (trust nothing she says). There is no guarantee that the convo will happen, but I need to make sure I at least have the knowledge and the practice to say/do the appropriate things if this event occurs.
Pain,
I'm no expert but I would not consider anything except actions. Saying things like "can we start on being us again?" etc is just that, useless words. Think back to times when you have first started any relationship, think of the actions the other person took to express interest in you, to show you that they wanted you. Not entirely up to speed on your sitch but if you did any pursuit and pleading after BD think of that but for the other side of the fence. If and when there is any remorse and a change of direction i think it will be pretty obvious.