No advice necessarily, just commiseration. My W reacted similarly when she found something she thought was a gift for another woman. Of course, I got angry when she accused me, same as you, but when I got over it a few minutes later, I simply walked up to her, smiled a big smile and said "You know honey, I was wrong, thank you for caring so much." and walked away. I don't think things were as heated as they are with your H but in the end, I chose to take it as a positive. If nothing else, you now KNOW that he will be affected when you do move on without him. I know we aren't supposed to be motivated by such things, but take a little solace in it.
