<human>: So this isn't the first post I've made about this situation, as I've came here before for advice and found very good help. The excessive conversations died down for a while until recently.

My gf has an ex of hers who lives a town or two away and she hasn't seen him in around 4 years. After one time of just glancing at her phone, I could see they were talking with long detailed text. However I could not make out what the conversation was about. Also recently I've seen they've been emailing for a couple days while at school, and it gives me an impression to that they almost always have to talk to one another. 

Now I've confronted her about it and she assures me that there's no feelings between the two and that I have no reason to be worried. Despite the reassurance from her I feel very uncomfortable with the amount of talking between them. 

Honestly I wish she would cut contact with him as he's been known to be a flirt, and I don't want to take any chances. I've talked to the ex about it and he assured me they were just friends. Again despite that I just can't shake this sickening feeling I get whenever I think of the two talking.

Am I being irrational? Should I try and just ignore it or get over it? I'm really uncertain as to what I should do. She's said that she is willing to cut contact with him if that's what has to be done, but I can't bring my self to make her do this.

Can you provide a brief overview of the text?
<bot>: Girlfriend and her ex have been emailing and texting almost all day everyday, and it makes me super uncomfortable. Despite reassurances from both parties I can't shake this sickening feeling. What should I do?