Hi sparkleleaf. Sorry you got hurt in all of this. I understand your resentment about him not being ready but in reality he may not have known that. He may have been feeling pretty stable and good and then realized that he wasn't emotionally ready to be in a relationship.
Recovery from addiction can take some time, years in some cases and maybe that's him? You don't want to be around an active addict and being in a relationship with one is guaranteed to bring you down so him identifying himself as being at a crisis point in his recovery shows integrity and maturity.
Now, that does not take away from your hurt at all, you were obviously in this for the long haul and not aware of how a relationship with an addict or recovering addict has additional challenges sometimes. At least now you know!
It's going to take time for you to heal from this, as you already know and that's not easy but you will not always feel this way and brighter days are ahead.
Hang in there, keep posting.