Would you feel uncomfortable with this?

Okay so I know a girl and I like her (she doesn't know this), we're both 18, thing is she has a boyfriend, anyway next week she needs a place to stay for a night, I said to her she wouldnt have anywhere to sleep, she knows I have a double bed and she says cant I just sleep with you? To be honest Im not really comfortable sleeping in the same bed with a girl who has a boyfriend, and lately she hasnt been getting along with her boyfriend much and she doesnt care what her boyfriend thinks, thing is I do and dont think its right tbh, guys would u feel uncomfortable with this?