Did you say that you are sorry? did you try to explain your reasons to her. You may sound casual as you like but must have had reasons for your behavior. They might have been your own or they could have to do with the couple.

You are telling us the facts but there are lots of emotions involved. Did you try to take care of them and clean them up?
Unless they are not cleaned I don't think there will be any peace between the 2 of you.

The old story can aggravate things, she can be saying to herself that she should have known better since then.
She is of course mad at you, but I guess she is even madder at herself