[There's a big difference between a tentative exchange of vital information, and accepting this guy as potential backup for what he's doing. He still has no way of knowing if he can be trusted, if he's a plant. He only has his own instincts, and he doesn't always trust those these days.]

Let me see your file. Then you walk away, let me do what I need to.

[He's asking for trust first, to be allowed to read private files and break in where he's not allowed.]

You don't follow me, I'll come back another time and we can talk about it.