i can't believe what people are telling you. I really can't. How come could they say so? Lack of experience? Eh?
But don't worry my friend, i am here to help you

first of all, i dont believe in rejection. There is nothing like rejection. Its only feedback. You got an ioi? Great, you got positive feedback. You got an iod? Just negative feedback.
Who the hell says that something is wrong with you? If any one says that, he would be the biggest fool here.
And who says that you lost the girl? No, you didnt. Its still gaming time. Game is not over tell she says you ,"fuck off" and in some cases even if she says that, game is not over.
Are you going to be shaken by behaviour and turn from a pua to into a pussy?
Who knows her behaviour is a shit test? She made the things awkward, situation seems to be out of control. And who knows she wants to see how you handle it? Do you get shaken and hurt or are you strong enough to stay firm showing her that you are not going to get affected by her shit? Think about it. No my dear, dont get affected, dont get hurt, it would make you weak and she is observing your behaviour, you want to sub communicate weakness? No, no, no. You are not weak, you just let things effect you, you didnt think about all these things that i am telling you right now. Convey the alpha image, no matter even if you are crushed inside. And dont worry about the negative feelings that you are having now, its just an emotional state, it has got no reality, emotions come and go, never let a shitty emotion shake you.
Now what to do regarding outergame?
Start by your behaviour, dont show her that you are effected by her. Have fun with your friends right in front of her eyes, show the bitch that if she is a bitch, then you are an Alpha. Ignore her, talk to everyone but ignore her (she may be thinking that you would crawl back begging, do the opposite and fuck her mind) if she talks to you, talk to her but dont show any interest in the conversation. Make her chase you (take away at a high emotional point), introduce jealousy and when she starts to chase you (text you, calls you, tries to talk to you) dont accept her immediately, make the bitch chase you a bit(you didnt lose the game, just situation got out of hand and you got to bring the game back to the normal stage). Then after sometime, start to show interest in talking to her and build comfort, after that break comfort and start building attraction, then drill her hard in qualification and game as normal.
Inshort you pass her shit test or just shit by behaving like an alpha and when she starts to feel attraction, you make her chase you (shaping her behaviour for the future) and then you come back to normal game
And dont care what some guys say here, most of them are virgins or guys who got a gf by luck.
Hope that helps