This is just a suggestion, but it was something that sort of worked for me.
After my WH's A, like you I felt like I had a thousand insecurities and a thousand questions, and he said he felt like he was always bombarded with questions that hurt him. I felt like he "owed it to me" to reassure me that he Picked ME, and he felt like I was constantly hitting him with stabs to the heart.
Sooooo...we agreed on two things. First, he agreed that he would say the words "I love you" over and over again--yes, it felt repetitive to him, but it soothed me and that was just generally helpful. Second, we agreed to limit our "questions and answers" to two per day. What that means is that I could ask TWO QUESTIONS about the affair, and he would answer thoroughly, honestly and openly. Thus, I was getting my questions answered and he wasn't avoiding me or telling me to "get over it"...and he felt like there was a limit to the stabs every day and there was "an end in sight." It wasn't easy to answer those two questions, but it wasn't unending, and if it did hurt, it wasn't going to be an all-night, four-hour, knock-down, drag-out fight...just two questions.
Does that make sense?? You get to have some of the reassurance and answers that you need...but you also learn to control yourself and that you can't go on and on and on. He gets some of the "we're not dwelling on this forever" that he needs...but also learns to be open and honest and face some of the pain that the A caused.
FNCJ
(BTW, sadly, in my case, my WH decided not to honor the agreement and ended up having another big A--and eventually we did end up divorcing because of it. <img src="/ubbt/images/graemlins/frown.gif" alt="" /> )