If thats the case, and it could be...it still doesnt mean that the original girl doesnt fancy him, she wanted to go on the date so obviously she mustve liked him.
But damn, what girl brings their best friend along on a date wtf? Thats like bringing a c*ck blocker along on a date with you just incase you made a move on her...maybe the whole thing was a wind up then if she only went with you if her mate came along
Anyway, did you get good feedback from the girl herself...forget about the fit mate she has, as others have said she sounds like shes playing games. So you want to know HOW TO PULL THIS ONE OFF RIGHT???
HERES HOW TO DO IT...make sure you go out with the girl again (not her mate), call her/txt her and tell her you want to meet up again but just the two of you...so her 'annoying friend doesnt get drunk and behave immaturely duh', afterall your sophisticated and mature right

lol...(thats what you want her to think anyway).
So when your alone with her, you have a nice time and you play it so you can go back to hers and fuk her.
She will inevetably tell her friend what happened (girls talk to their friends all the time, so you didnt even need to talk to her friend and now her friend knows about you already)...also you look like youve just shunned the fittest one (your date will know that her friend is better looking than her, and her bigheaded mate will know she was teasing you and she is the better looking of the two, hence why she had more confidence) but youve basically had sex with the not as good looking one.
Now heres the key...YOU MUST BANG HER TOTALLY SH*TLESS, get on top of that p*ssy in missionary, push her legs behind her head and fuk her brains out till she cums, then keep on to see if she does again. (Lol, i know its effort, but if you can stay hard, use any means, then itll work).
Then when she tells her mate (who thinks youve shunned her)...thats when you ask to meet up with her again a week (or a few days later), say that she can bring her mate around if she likes aswell, that youve been thinking and she wasnt that annoying, just a bit drunk, that her mate is cool really.
So now your on another date with the girl youve banged and her c*ckblocker mate...except this time YOU DONT ACT ALL SUBMISSIVE AND WEAK LIKE YOU HAVE OBVIOUSLY BEEN WHEN THE PAIR ARE TOGETHER, just start snogging the girl you have already banged and her fit mate will soon get jealous (shes the big headed good looking one so how dare her mate get the guy instead of her right?) When youare snogging her (make sure your facing her mate, the back of your girls head is facing your mate)...open your eyes and make eye contact with the fit one, just keep looking at her whilst snogging the other one, give her the eyes mate, you know what i mean, maybe a wink...then afterwards just suggest to have a threesome, see what happens, bring up last time when the mate said she found you really hot, see what she says when put under pressure.
Thats what id do mate. It is a win win situation. You at least get to fuk one of them, if the threesome doesnt work out then who cares, at least youve just played them and shown the silly immature big headed girls that youve taken them for a ride, youll make the fit one jealous by banging her mate...so even if theres no more sex after that who cares...youve just turned their pathetic little game around on them.
Thats what you gotta do to girls who start playing stupid games, show them that you dont care...sexual games are for immature kids...when you get on that p*ssy just bang it really really hard.