It's a difficult sense of betrayal loving or having loved an alcoholic/ addict. Typically a wide range of emotions are experienced.
Whether you join a non type support group, attend therapy, or just read up on the effects, know you aren't alone.

I wouldn't worry about his withdrawal from you, as being a sense of shame, as though his self revelation was profound, perhaps not the bottom out necessary.

Important thing, is you, your sense of belonging in this universe, your needs, wants, desires.