jealous

Terra
My boyfriend is divorced, we have a very different situation, I know the ex wife. 
The ex wife I feel is constantly texting and calling him and I just feel like since they are divorced they don't need to be talking as much unless it's about the kids. 
I get somethings that need to be talked about and I'm not saying I want him to shut her completely out... I just wish they didn't talk so much. Is it wrong to be jealous she's getting attention? How do I tell him I want his attention rather than her getting so much. I know he loves me, I have no doubt. 
Is it stupid to be jealous?