Don't beat yourself up about the "infidelity thing" in an alcoholic.
It is tru she may/probably/does love you more than anything/anyone else with the one exception being her love for "alcohol"
They can and do do strange things, all bets are off, they even function during blackouts.
I wouldn't drive yourself crazy. You are dealing with "CLINICAL INSANITY" and there is no reason to drive yourself crazy or stress out trying to deal with it.