I feel crazy

I know I’m going to sound paranoid and crazy and pathetic.

But my boyfriend is talking to this girl on Facebook messenger. They’re not even friends on Facebook, I don’t know how he knows her? As he talks about the friends he sees most often to me. And he’s never mentioned this girl.

As far as I can see, they just talk about gaming. But it’s like he’s deleted the message beforehand, and only responds to her when I’m not around. He’ll ignore the notifications on his phone if it’s her, when around. And he angles his phone away even though with everyone else he wouldn’t mind me seeing the message.

I just scared that she has more in common with him that me. I hate games and xbox and stuff...