I told him to get drunk with me. He refused. I feel that he closed off being open with me because he won't even let his drunken side show in front of me, but would with her.
Our, I wouldn't jump to the conclusion he's not open with you because he won't get drunk with you. He knows you don't drink, he's probably uncomfortable that your forcing that on him to prove something.
You said you do many things together though. Think for a moment that he may not feel comfortable doing things with the OW that he feels comfortable doing with you.
You don't have to be like each other or do the same things to be open with one another. Opposites attract in most cases and those are usually the relationships that can survive the long haul IMHO because it keeps the interest level peeked.
"It is curious that physical courage should be so common in the world and moral courage so rare." -Mark Twain
