Should my boyfriend go out with another girl alone?

My boyfriend is good friends with another girl (who is single and a year older then us). He said that they are making plans to hangout and drink one night soon. I asked if it would just be them two, and he said yes.

He's never shown any signs that he will cheat on me, but they will be drinking as well, so I'm unsure about this.

I want to tell him I don't want him doing that, but I don't want to be controlling.

What would you do?
Should my boyfriend go out with another girl alone?
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