Need advice

Natalie
Hi girls 
​I need advice on something 
​So my husband has not heard from one of his friends overseas... And they're not on fb as friends ... The only way for now is through email. And he just told me he has emailed him and he hasnt responded... So today he told me to remind him to send him another email to him orrrrrrr to his wife
​Now ... i dont like this girl at alllllll
​She's too flirty  
​And lets just be honest im super jealous of her because my husband talks abt her sometimes.... She just makes me feel super self conscious and small ... Thats my problem and i know it 
​Now i dont want them to be in contact through  email whatsoever 
​How should i tell him? When he told me i just said maybe he's on watsapp or viber or something... Try that
​Now the convo abt them is gone 
​How should i tell him when that subject is over ?? I dont wanna be so obvious that i have a problem with herrer ... And what should i sayyy exactly?? 
​Please help girls