should i say something to him?

i dont think iam insecure? but theres this girl that feels attracted to my husband..she is cousins with some of my cousins so everytime there is a family gathering of course she will be there..i really dont care what she thinks or feel or even if she stares at him..but the problem is that my husband always looks back at her..i have nothing agnaist the girl or whatever iam mad at my husband for going back and fort with her looking at eachother..i felt uncomfortable..i want to say something to him but i dont want him to think that iam insecure or just trying to fight with..or should i just let it go??