<human>: As I said I feel like I am over thinking this, but so or not, I can't shake the feeling of uneasiness. Maybe you can help me figure out my feelings and the situation.

My girlfriend is rather shy, but recently I started introducing her to my group of friends. She opened up a little, but there is this one guy in front of whom she feels visibly uncomfortable with such simple things as pecks on a cheek, for example. If I put my hand on her lap, she tries to shake it off, if not very strongly. Etc etc. This doesn't happen when he's not there, or so it seems to me.

She is also always smiling at what he says, and at his most mundane jokes - it feels as if she wants him to notice her reaction more than anything. Again, she's more shut in with others.

I am not willing to look through her messages for this. And at this point, I don't think I should talk to her or him about this. I want to have some confidence I'm not dreaming things up, and being a possessive insecurity.

What would you suggest I do? My problem is that this bothers me too much, I feel like I cannot trust her completely and this eats at me. I want to either stop worrying about nothing, or get to the root of this.

Any advice is appreciated - either ways of checking what this is about, or your personal experiences of similar situations.

Thanks.

Give me the gist of the text in a nutshell
<bot>: I feel like my girlfriend wants to appear emotionally available to one of my friends. I want to know if it's true or I'm imagining things.