<human>: Provide a brief overview of the text.

I don't know if I'm over reacting, but yesterday my boyfriend casually asked if I minded if his friend (a girl his age) stayed over a couple of nights.  His parents are away for a month next month, and we had planned that I would be there most nights.  

I said, I guessed I didn't mind, but he could see I was a bit uncomfortable with the idea and said he would say no if I wanted him to. I said, oh no, I don't really mind, and we talked about me meeting her ect. 

But since then I can't stop feeling weird and stressed about it.  

He met this girl on tinder a few months before he and I got together, but they never hooked up. They've never met in real life even though she's only an hour away. She has a boyfriend, but complains about him to my boyfriend all the time.  

I trust my boyfriend not to deliberately try and cheat, but I don't trust her, and if they hang out, get drunk, sleep in the same house, I could see something happening.  

This girl was talking the other night about how her boyfriend chats to other girls online and she gets jealous, but then she thinks it's ok to stay with someone else's boyfriend (a guy she only knows from chatting online) for two nights in his house?  

It makes me feel really really uncomfortable.
<bot>: I just feel like it's not really appropriate for them to spend three days and two nights together, am I wrong?