Why did this girl I like ask me if I wanted to go with her to get something and ditch me?

i saw the girl i like with her friend walking the opposite direction as me and we both said hi and i asked her were she was going and she said to the

i saw the girl i like with her friend walking the opposite direction as me and we both said hi and i asked her were she was going and she said to the girls locker room to get something and she asked me if i wanted to go and i said sure. i walked with her to the back door and i said ill wait here while they went in side. i waited there for 10 minutes seeing a couple girls walk in and out. i dicided to leave thinking wtf. the next day i had first period with her and i walked past her and she said hi and i kinda just waved and she said that the door was locked and they couldnt get out. why did she leave and lie about it the next day?

or:i saw the girl i like with her friend walking the opposite direction as me and we both said hi and i asked her were she was going and she said to the girls locker room to get something and she asked me if i wanted to go and i said sure. i walked with her to the back door and i said ill wait here while they went in side. i waited there for 10 minutes seeing a couple girls walk in and out. i dicided to leave thinking wtf. the next day i had first period with her and i walked past her and she said hi and i kinda just waved and she said that the door was locked and they couldnt get out. why did she leave and lie about it the next day?

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