<human>: Boyfriend of 4 years and I took a break for a couple weeks. After a while we got back together, he told me he had sex with someone and although I was hurt, I understood and let it go. We've been back together for a month. The woman he had sex with has kept texting, emailing and calling him. I don't think she knows we are back together. He also don't know that I know because I snooped and I know its bad but this girls name kept popping up everywhere. 

Looks like he isn't responding to her messages and she thinks she did something wrong. I'm not angry at her so I want to tell her and maybe she will back off. Either that or tell him to stop, but how do you do that without telling him that I snooped. I dont know what to do. Should I call her as a 3rd party? Or should I have a talk with him?

Can you summarize the given text in a few sentences?
<bot>: Girl from boyfriends previous hook up during our break wont stop contacting him. Don't know what to do, either call her or talk to him?