I'm afraid that he thinks he has the upper hand right now, he thinks he's winning this "game" and he's fishing to find out what I know and how soon I'm leaving.
Maybe it's not clear from my posts, but he's ready to walk. He's in a deep emotional and physical affair right now and is not in any way, shape or form sorry for it. He feels like he's entitled to it.
I don't see how sharing my inner feelings with him to show him I'm vulnerable will help.