My girlfriend has been messaging another guy from work a lot.  When I ask about it, she says they're just talking about work stuff, but I can't help but feel a bit weird about it.
My girlfriend has been messaging another guy from work a lot recently.
user
do you think they are up to something?
assistant
I can't help but feel like they are.  I have asked her about it, and she says they're just talking about work.  Maybe I'm just envious of the attention she's giving.
user
You should be careful about jumping to conclusions. 
assistant