Would you let your boyfriend sleep over at "friend's" house who's a girl?

I've been dating my boyfriend for nearly 6 months, so the relationship is still quite new. He's got a lot of female friends, which is fine, but he's off on a road trip next weekend to see a girl he's been friends with for a few years. She's at college there studying, and lives in student accommodation. He doesn't want to pay for a hotel, so he's sleeping in her room. Also, 2 months before I told him my male gay best friend was sleeping over and he said that was fine, as long we weren't sharing a bed (we weren't). He also said that he expected me to be fine if he ever had one of his female friends sleep over at his house, to which I said it was okay as long they were in his spare room. He agreed. I still feel very weird about it though; I have friends who are guys but I'd rarely have them sleep over. The only exception is if they're drunk and can't drive home. I'm still uncomfortable about him sharing a room with this girl though; she doesn't have another bed and I don't know their history. I trust him, I really do so I hate to feel these doubts. Am I being unreasonable?
Updates
+1 y
UPDATE! okay guys, I've had a conversation with my boyfriend and I've told him my reservations. The reason I'm not going with him is because I'm on holiday next week from Wednesday onwards. He's got no history with this girl, theyve always been friends but he's checking into a hotel. He was never going to share a bed with her (sleep on floor) but understands its hypocritical of him to say to me that I can stay over at a guy friend's house unless its in a different room.
Would you let your boyfriend sleep over at "friend's" house who's a girl?
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