Reading this was hard. My heart goes out to you having to hear all of that. At least she gave you the details you asked for, that is a start. It took my husband over a year to give me all the true details. Made it ten times more painful by lying and hiding the truth. Details hurt, but I needed to know. Hearing your spouse tell you those things can make you feel like you are being gutted alive.
Honestly, it doesn’t matter if she orgasmed or not. She was in a fantasy world where she felt like a sex goddess. The sex was fun because she got lots of compliments and attention. It was all about her. She was addicted to the high of feeling sexy and wanted and dirty. She got quantity over quality. I know it is hard on you. The mind movies are horrendous, but it really wasn’t about you at all. It was about her and her insecurities.
BH seem to be hurt if AP has a bigger penis. I know for many men, that seems to be what they think is a measure of their manliness or performance in bed. For what it is worth, I feel (as do all the girls friends I have ever discussed with) that unless it is extremely small, it doesn’t matter. I know there are some women who care, but most do not. I know it sounds cheesy, but what makes a man is his character and how he handles himself in life. What makes a great performance in bed has to do with the connection the people have, how attentive the guy is to the woman’s needs, if they have the same sexual preferences, enjoy each other, etc. A lot of it is mental buildup too. Please don’t dwell on the penis size, it really means very little and is not a measure of a man at all. You are hurt and trying to find something about you that would make her want to do this. You won’t find anything because it wasn’t about you. It is about her brokenness and dysfunction.
Please take care of yourself. Get some help from a therapist. The hurt stage is just downright awful to live through. The anger phase is a bit easier because it is focused outwards at the proper person, but scary. You will probably see a side of yourself you did not know existed. You may say and do things you never thought possible. This will get a lot worse before it gets better for you, but it will get better. Try not to lose yourself in this shitstorm.