Dudes, WTF, she's giving him an option for social proof. If she's dating that friend of her it wouldn't work out anyhow. Cause if she's intrested she wouldn't bring her boyfriend. If she isen't you can become friends with the guy and he might become the best social proof you'll have to win this girl over.
If he likes you it will improve your chances with her and you'll have a new friend...
People need to embrace the chance of meeting new people! Who knows maybe the friend is female, maybe it's the coolest guy you'll ever meet, maybe it's your next wingman.
If he's a douchebag you'll know her taste of friends doesn't mix with yours so that's a sign you and her might not click. Through her friend she'll get to know you better and you'll get to know her better. She's giving you the best option you have and you're already coming of as insecure... Confidence my friend, chicks love it.
Text her back: "Great! Let's meet up at XYZ". Jealous guys never win and women smell unconfident men. She probebly wants an opinion on you by her friend, so remember, the day of the date, it's all about the friend, not her... He's the social proof, he's selling the tickets to the game (aka her p-ssy).
If you're the coolest guy he's ever met without embarrassing yourself, you probebly won't have to do anything... Show them around town and make sure both of them have a good time, especially the friend.
Excluding the friend
what were you thinking