I have no idea what you have to do now.
I mean, there is no walkthrough/hint file here.

Ofcourse he pays more attention to you if you sit right underneath him. What would you do if some Tom Cruisy(Or Brad Pitty, whichever you prefer) dude would sit right next to you? You would pay more attention to him, that's what.

Seriously, this thing that he doesn't get so tense anymore is kinda iffy. I mean, if he stopped feeling that fear (of fucking things up), then that literally means you have become friends with him.. And.. Yeah :/ Seriously, this ending simply sounds too bad.

I guess you simply have to confront/torture/ask him. Or give up.
Because seriously, if you stir a soup long enough, it WILL get cold.

Good luck.