<human>: Give me the gist of the text in a nutshell

Hi Reddit, Thank you for reading this.
I'll try to keep it as simple as possible. 

**Background Story**

1. He lied about a girl(A) like it's his coworker and they never had sex. - Turned out it's not his coworker and they slept together before we started dating.
2. A and my bf went for drinks after we decided to be exclusive. - He didn't tell her that he's seeing someone. 
3. We broke up for about a month and he called his ex fwb(B) during that time period, she stayed at his place for one weekend.(she lives 6 hours away) He said they didn't sleep together but turned out they did. 
4. His ex fwb's last text message was "I miss your face" - I didn't snoop, he showed me by mistake? 
5. She also stayed two weekends during the summer with him before we met. 

**Argument** 
I asked him to tell her that his gf doesn't want her to talk to him anymore so don't message him. Also asked delete her on facebook and show me the conversation.

1. His side : B is a good friend who came over from a different city to make him feel better when we broke up. B didn't do anything wrong to him so he can't delete her on facebook. However, He'll do what I asked(tell her that not to message him anymore). But he doesn't really want to do it, and doesn't think he should do. Also he's not gonna show me the dialogue. I just need to trust him.

2. My side : Ex fwb, especially slept with 2months ago and said miss you is not a just friend. 

**My Question** 
Are they really just friends? am I just overreacting and being super jealous?
<bot>: my bf thinks his ex fwb is a good friend and refused to delete her on facebook. I think he should cut her off.