<human>: Can you provide a brief overview of the text?

I've been dating my SO for about 4 months. Since we've started dating it has only been about love, laughing, and foreplay. We haven't had any issues at all, we tend to communicate very well when something is bothering us. Lately though I have been getting a bit jealous if one of his friends[F18] they are always talking while I'm at work/school and so on. I didn't really mind at first. It wasn't till recently that I met her in person. I saw how flirty she was with him, in front of me. She also hinted a lot of stuff they talked about. Like talking about my intimacy with my SO. I kind of got used to guys talking about that to their GUY friends, I never had that happened with a girl. It bothered me. I just don't like her. You can consider them best friends, but they only recently started talking. 

To be honest, I'm just a bit insecure. I feel like she wants to take him away from me. I have reasons for this... We broke up for a bit, she was dating his best friend. She dumped him, and when they were both single she tried every move on him. Thankfully we still talked and wanted to be with each other. So I don't THINK anything happened between them. How do I tell him she bothers me? and the fact that he talks about our personal things with her?
I'm usually good with talking to him, but this time I can't, like the words don't come out. I don't want to be that girlfriend that doesn't let him have opposite-sex friends. But this is REALLY bugging me.
<bot>: Boyfriend has a female friend that possibly still likes him, they talk about our intimacy. It bothers me a lot.