Should I let my boyfriend stay with his female friend for the weekend?

Anonymous
My boyfriend has a female friend that he knew from college. She lives about 2 hours away. Anyway, they often catch up every couple of months and he goes down to visit her. Something which he's always done before he met me. There's been no history between them, and he helped her though a bad break up. He's always said they've just been friends. Anyway, she's recently been in touch and asked if he wanted to come down for a weekend this month. I work some weekends so it's impossible for me to get time off.

As me and my boyf are still quite new in our relationship, he's not gotten around to telling her he has a girlfriend. Before I met him, he was single for 2 years.

So I'm torn. I've told him I don't feel comfortable with him staying over at his friend's house, and everytime they meet up they get really drunk. On the other hand, I don't want to stop him from seeing his friend... he doesn't have many. Am I being unreasonable to think this way?

Updates
+1 y
1/3 - Wow. I did not expect this to get such a large response. A big thanks to all those who have commented and I appreciate your opinions. I agree that the wording on the question was poor with "let" and that wasn't what I intended - he is ofc, his own person and can do as he wishes.
So here's an update and some more context. He sees this girl every 4 - 5 months or so and can go long periods without speaking - hence why she doesn't know about me. 1/3
Updates
+1 y
2/3 - He agrees its about a level of appropriateness and now that we're in a relationship, being respectful of each other's feelings is a priority.
He has now told the girl about me, and as I'm keen to meet his friends (as I said, he doesn't have many), we're now both going up to see her for a weekend I'm not working. 2/3
Should I let my boyfriend stay with his female friend for the weekend?
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