Well I was watching all the cutscenes to the force unleashed and I observed that Galen doesn't like to be touched casually or at all in anyway whatsoever. Maris Brood placed her hand on his chest for like a split second and his eyes shot down at it sharply, then back up at her in an offended way.
When Galen confessed that he would never see Juno again she approached him. He swiveled around suspiciously because he is a very suspicious and privy person of course he has to be and she kisses him! He seemed scared to death at this unexpected move by her and obviously he REALLY wasn't expecting it. I can picture him as a cat or something and his fur just stands on end out of fright. I just found it really funny. He's definitely NEVER been a Jedi before and he's obviously been a sith for too long.
You can tell he was raised with no human contact whatsoever, except in combat.
I'm implying that Galen is such a privy person and he's still transferring over from his darkside experience. I guess I'm teasing him in a manner of speaking for his reaction to Juno's kiss. He was genuinely surprised for a split second.
TFU and Characters(C) LucasArts