For what it is worth...once we are "all in" in a romantic relationship...beginning with the very exciting rose-colored days of early attraction....we all tend to see what we want to see and believe the parts of them that we want so badly to believe....
This applies to all romantic relationships (largely due to the cascade of powerful bonding hormones.....Not--just with acloholics….
There are many broken marriages or broken relationships for the very same reasons, without alcoholism in the mix. In "love" we tend to see what we want to see and believe what we need to believe...
Did you ever hear the old saying....."Love is blind"....