“Dropping the mask” is something I talk about extensively in the article link below…
After that guy determines that you really like him, he has you, and he’s no longer worried that he could lose you to another guy.
The guy, if he hasn’t already, starts talking about how he doesn’t want to be in a relationship for some reason.
the guy change his mind if you’re going to stick around regardless of whether or not you’re in an explicitly committed, exclusive relationship?
He feels secure and he feels the current relationship dynamic is secure.