Guy I’m seeing staying at a chicks house

So this guy I’ve been seeing recently is staying at his friends house who is a girl (who I’ve never met) is it wrong to be jealous??? Like I havnt said anything bad about it but it annoys me like I asked him, can I call you and he said he can’t bc he’s sleepin at his friends house, makes me feel as if she’s more then a friend, apparently they have been friends for ten years? But I’ve never hesrd of her and he wasn’t upfront about it