Insecurities

So I fully accept this may just be me, being insecure.

But my boyfriend the friends he talks to most over FB messenger are girls. And I think there’s very little chance he would actually physically cheat on me, but i sometimes think he only talks to them when I’m not around, or opens up to them more about things than he does with me.

I obviously don’t want to control who he’s friends with, and wouldn’t ever do that. But I just find it a bit odd. With most of his friends, he’ll talk about them to me - show me their conversations and tell me stories about them. But not these two girls. The only reason I would know about them is by accidentally seeing notifications pop up on his phone when he looks at it, long messages from each of them.

I know communication is key and debating how I can mention it without sounding incredibly nosy or like I don’t trust him.