Is it normal to want to hear your wife talk about other men during sex

i found out my husband was using the Internet to talk to woman. he was going on chat sites and porn sites to find woman to sexchat with. it had gone to the point he was even giving out his cell. i confronted him, he swore to me that this was only an impersonal thing and he has never met with anyone or physically cheated. he said he never even "chatted" with the same woman twice. he admitted to having a problem with porn and that somehow he had gotten carried away. he said that it was the whole stranger thing, that hearing them talk about their "slutty" ways is what got im off. he said he just liked to hear about it and never would act on it. i forgave him, he has been very open since, we have become stronger for it. he asked me to monitor the computer & phone, put up blocks to help him resist his urges. now in the past week, my husband has begun asking me, during sex, about my past sex life. he has even gone so far as to ask questions about a specific ex that he really hates. it made me uncomfortable because he is a really jealous guy,(why would he even bring this a-hole ex up?). when i finally started answering, mostly just making things up to shut him up, it got him so hot he popped instantly. this has happened a couple of times now. now that's all fine except the next day he was so upset about the things i said, he doesn't get mad at me, he knows he was asking for it but he says it pisses him off & really turns him on all at the same time. he told me he has had these thoughts for a long time. after looking into it i learn about "cuckold" & all that. this makes him feel better knowing this seams to be a common fetish. but he says that would never be an option, he could never stand to see me with another man. which is a relief to me because i would not be happy doing something like that. so now were at this stand still. how can we satisfy this urge he has without damaging our marriage? i want to please my husband & i want him to be satisfied but to indulge this fetish would be a disaster. he wants me to be happy and secure in our marriage so he has cut off all his Internet porn and chats. so now I'm wondering if i should just tell him to use the web to get off or whatever, with the stipulation that he could never give his number out or meet with anyone. but there's that part of me that is saying even though he loves me its only a matter of time before he gets carried away with it again. what if he can't help himself and he ends up needing more? and i don't know if i could resist the urge to hack those accounts and see what he has been saying to these other woman because, can i trust him? and there is also a sick twisted need i have to see what he's saying because then I'll know more about what it is he's looking for so maybe i can spice things up a bit for him too. I'm looking for possible alternatives because if there's anything i can do to keep him satisfied and not have to use other woman to get off I'd love to hear it.