It seems like dialogue is working against you. Maybe he is just anti-dialogue. Let it go for now, and go to the Retrouvaille session. Maybe you can talk to someone there about how to proceed. I do agree with Smiley that he is not giving you genuine answers, he is doing easy answers to show he is smart and can manipulate the system. Don't be afraid to take one of the leaders aside at Retrouvaille and ask for help.
I went to Retrouvaille a few years ago. My husband was anti the dialogue just because he didn't want to be bothered. He didn't sabotage it, but he refused to do it every night. We came to an agreement to do it 3 times a week. Sometimes it was hard to get even that much, but since he'd agreed to it, most of the time he would do it.