Laura.......first of all---you really do need to learn a lot more about alcoholism----as in it is not possible that you were the cause of his drinking. He was an alcoholic when you met him!
He drinks because he is an alcoholic---that is what alcoholics do.
All of the stuff that he is showing the world---trip to Spain, surfing tender, hanging in pubs----that is not a proof of happiness. That is just a public face that he is putting on.
lol....think about it----if going to Spain and sitting in a bar and swiping tender could cure alcoholism and create happiness---the whole world--- millions of people would beat a path to some bar in Barcelona for the "cure".
Stop looking at his insides from your outsides.
Other women? Not to wonder about them and comparing yourself to them. Any relationships with them will have less of a chance at survival than a snowball in the Sahara Desert.