IMO, there will be a time when he is ready to talk. But I think it is important that he take the lead in this. There is so much shame and humiliation in our using (me, alcohol) that sometimes it is too painful to face in the beginning and it will make us want to run and hide or use. I would suggest going to a Al-anon or Nar-anon meeting and sharing there. It is important for you to talk and share and be heard.
I am working the steps and slowly but surely I become more comfortable facing my past. I know that I will face so much more and I WILL make my amends to my husband when I work my 8th and 9th step. He knows this and today does his very best to look forward with me and share in my newfound joy in recovery. That is not easy to do if there is a lot of resentment built up for you. I believe he will be able to hear you and discuss this in time as he recovers but in the meantime, you can share this with others that have gone through like experiences with their loved ones.
Good luck :ghug2