Here's emotional cycle of change done as a picture.
Sounds like he was at "happy" and then the "fear" started coming on.
Perhaps those links give you some insight? Keep talking. Nobody's Opening anything but "Opening in Mind" to each other to just TALK about your thoughts and ideas and whatnot.
Maybe in the end you decide it's just not for you. But have grown closer for the sharing of thoughts. That's not so bad right?