indifferent.... in Check Yes Or No????

So i made the decision to talk to my husband and let him know how i am feeling, I told him the basic - i quite often find myself feeling like i want to have sex with other men and that i feel like we are really distant in our emotions and physically as well, i told him that i am struggling in our marriage and that i feel like i am drowning and cant stay afloat his response to all this was ” i am indifferent to this if you want a divorce let me know, i have thought about being with other people but i have weighed the outcome and to me it wouldn’t be worth it because if i cheat then i will end our marriage and i will have to pay child support for our kids not to mention i would end up having to pay alimony…” he went on for a good 30 minutes with this whole thought out list of things he would do or have to do and i am just sitting here on our bed thinking that he is just with me for our kids. I know i sound silly saying that i want attention from another person and i’m so shocked when i find out my husband has thought this as well. I was shocked because not once has he ever expressed his feeling about this, where i have told him how i felt several times. I began to think that maybe its something we should discuss at a later time ( he is away at work) as for right now i am stuck in my head thinking that maybe we were wrong in all this or maybe we need to do something about our life together. For me i know i want to be with him forever which is why i married him but i’m not sure if i want to be with just him? Maybe an open relationship or something but i couldn’t imagine having to share him with anyone, which is hypocritical since i want him to be fine with sharing me.