Uncomfortable About Boyfriends Female Friend?

Ill try to keep this short.

We have been together for 2 years, he is faithful, I can trust him etc

He ran into her at a store & she was an old friend of his (they used to like each other though)

Now he says he wants to hang out with her and make her part of our circle of friends

I know I should give her a chance but I really dont want to

I cant help but feel a little jealous for some reason

I know Im being irrational

What should I do? Right now Im thinkin of just meeting her, if I dont like the vibes shes giving off, Im just gonna let him know she cant be a part of the "circle"

But what if he doesnt listen & wants her to stick around anyway?

Thanks