Personally, it helped me clear the air. I will admit my ex's addiction really was not one of sobriety, it was another form, but it helped me a little bit. We were capable of having a sit down and actually express ourselves and what we came to realize. No one is expecting you to embrace him or even date him again. Do whatever you feel is right for you. Burying the hatchet was the greatest thing I could have ever done. The truth hurt greatly, but the world was off my shoulders to know that that person was fully honest to me for once and was able to have this conversation for me.
I hope this helped you a bit. Good luck and I support whatever decision you ultimately make. You are the only one capable of determining what is best for you.