Good evening guys ,
For the past 3 month i am using the material and it really help me alot . especially the "meeting stranger " part .

I really like this girl in my class for the past 3 month . i try to meet and create comfort with her . i try every possible way that i could to win her trust and comfort . C & F , finding commonlities.
3 month has past , yes the bond between us is merely stronger . She didnt talk to me last time but now , she is more comfortable around me .
But now she is closer with the best freind of mine and they really spend time together whenever there is chance . My best friend is very quiet and didnt social much especially girls . This what confuse me ... this is what my chaostic mind keep on thinking " what is the step that i gone wrong , and why my best friend who merely talk to her attract her ? why i lose to my friend ?"

What should i do bros ... i know i should not felt jealous about my friend(especially BestF)because its so un-manly ... honestly this is what i am thinking .

Guys , Should i just left that girls ,who is my classmate, alone and continue to be nerd as b4 ?

Thank guys ... and i really appreciate any opinion that you guys gave .

Thank again for helping me , this is the only place that i can find help . thank guys.

Maybe you didn't do anything wrong. Sometimes two people just connect because they really like each other. Maybe your friend appeared mysterious to her and that attracted her, or it could be a number of other reasons, but that doesn't matter.
If she likes your friend, that doesn't mean you did something wrong or that he is better than you, don't over analyse this. Don't go back to being a nerd, keep reading, keep improving, talk to other girls and be happy your best friend found a great girl.
Good luck!