Be careful that you aren't pushing for a detailed confession more to feel justified in your anger and distrust, than as some way to move forward.

It can be very tempting to want an, "Aha, I knew it" moment, but it won't give you the result that you are seeking.

You have said that you both discussed it and know the reason for it happening, and she is sorry. Now, over time, you work towards forgiveness and rebuilding if you want to keep the relationship going.