He may have actually quit and many people do quit without AA. One way to check is to ask him if he is committed to NEVER drinking again.
Now, just because he quit drinking, assuming he did, that doesn't mean he doesn't have a lot of other issues to deal with.
I think it was anvilhead who said that when you wring the alcohol out of an asshat your still left with an asshat.
If you want to be together this is something the 2 of you together are going to have to work out.
Your friend,