sparks it sounds like she was just giving you some displaced anger
when it comes to your s, you have every right to make sure everything is in place SHE should have been apologizing to YOU, for not leaving the swaddle honest mistake, i know, but how can she possibly be angry at you for that irrational displaced anger, or maybe guilt
yes you should leave your questions about the affair alone if you are going to forgive, you need to move on from it and the letter, well, i have done that, and regretted it immediately but it is done and move on from it
she made a very dramatic exit, throwing the food in the sink
she sounds very angry right now and you did well at keeping you cool very well done