Sorry for what brings you here.
You didn't ask a specific question, so I'm not sure what kind of response you are seeking. I think you are wondering if this is a cheating issue, or a drinking issue. I don't know.
You say your husband doesn't drink alcoholically, never blacked out before, until he was caught kissing another woman. So what does he not remember? The kissing? Or the getting caught? Do you think he was that drunk? Or is that something he's claiming?
Alcohol, in quantity, is a mind altering substance. How you move forward I guess depends on if you blame the behavior on the alcohol and can forgive your husband. Or not.
Counseling could definitely help.