Guys, would you let a female friend know that your best friend would only want her as a fling (she told you she wanted a relationship)?

You have a best male friend who is interested in a female friend of yours (female friend who you see once a week at most) as a casual fling. When visiting alone with your female friend, you find out that she's looking for a long term relationship, and not casual flings. Do you let her meet your best friend and go out with him, so that your best friend can get what he wants, or do you warn her that your best friend is just interested in casual flings?

Guys, would you let a female friend know that your best friend would only want her as a fling (she told you she wanted a relationship)?
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