<human>: Can you provide a brief rundown of the text in within 3 sentences?

Ok i'll try and keep this brief. My girlfriend lives at home with her family but tomorrow night they are going camping and so she'll be home alone. She invited me over for that night but unfortunately I had already promised my mum 2 weeks prior that I would be at home tomorrow night to babysit my baby brother.

So I said I'd come over during they day and we'd have a really fun time during the day and then I'd have to go home around 6pm-ish. I said I was really disappointed that I couldn't stay over and that it was a shame. 

So she replies by saying "No problem, a fun day at my house sounds good. I think i'll invite my friend [lets call him Bill] over to stay so I don't get scared". Straight away I'm not ok with this and there are alarm bells ringing.

Firstly, she has a very flirtatious relationship with Bill and he has liked her for 2 years and recently told her that he was in love with her and has on several occasions, be it implicitly or explicitly, said that she should break up with me for him.

My girlfriend and I talk more about him sleeping over and it turns out she wants him to sleep on the floor of her room, 2 feet away from her. She wants a guy who is in love with her, who often asks her to break up with me for him and who is frankly a bit of a dickhead to sleep in the same room as her when she is home alone.

Her reasoning? She is scared. She's an 18 year old girl living in a very well off area of our town in a house with a fence and alarm. I can't see a reason why she would be scared, I said I'd skype with her most of the night if that would help her too but she insisted it wouldn't.  

Am I right to be 100% not ok with this and pissed off that she would even think this is ok? 

Or is it ok and she should be fine to have him stay on her floor and I'm just being irrational and unreasonable?
<bot>: Girlfriend wants a boy who loves her to sleep in the same room as her. Am I right to be pissed off?