@juliejulieleelee,
He's probably the only person who can really answer this question.
Be that as it may, this so-called friend is essentially asking for your boyfriend to be his wingman. And, bottom line, he should be asking an unattached friend to do this. There is no reason whatsoever to, specifically, involve your boyfriend. This is not like him asking your boyfriend to facilitate a meeting with a known friend or relative already familiar with your boyfriend. Instead, it's to pick up strange girls.
This friend should also - as should your boyfriend - realize that this isn't finding a wife for anyone. This is getting the guy laid and it's nothing more.
That's not your boyfriend's job.
The friend should have never put the guy into that position in the first place. And, let's see this from the perspective of the unsuspecting women at these bars. Girl #1 is chatted up by your boyfriend, likes him and thinks he's a nice guy, particularly when he doesn't try anything physically. Girl #2 is chatted up by the friend. Then the end of the evening arrives and Girl #2 and the friend leave together. Girl #1 is given the cold shoulder and is told, "Sorry, I've got a girlfriend."
I am, frankly, surprised that your boyfriend doesn't have astronomic dry cleaning bills from cleaning off all the drinks thrown in his face, or has a permanent hand print on his mug from all the deceived yet hopeful single women who've slapped him into next week.
I, personally, don't agree with the limitations on opposite sex friends, but this is your relationship and not mine and if these are your ground rules then that's that. The paradigm hasn't shifted. Your boyfriend is playing with fire and he and his pal are being unnecessarily mean to some innocent women.
This crap needs to stop yesterday, and it's not even because of how it makes you feel. It's bait and switch and it's nasty and wrong.