Is she a fake friend?

I have been friends with a work colleague for few months and at first i always helped her finish her work as well as still helping her after i finished. We used to go out but somehow stopped and after sometimes she completely switched up on me and i haven’t done anything? I was always nice to her. She kinda avoids me now and stopped giving me lifts back home with the excuse of her door handle being broken. Tonight there was a staff party and i wasn’t going to attend if she wasn’t there as she assured me she wasn’t going because she wasn’t interested. Today i show up at work and she had her hair done and i was like okey weird but that doesn’t mean anything? After i get back home from work after again helping her finish faster she randomly dms me and says “oh yea btw im going to the party im so nervous” . I was completely saddened by this as i felt completely betrayed. I don’t understand what i have done to deserve this. Any tips on how to deal with this?🥺

I have been friends with a work colleague for few months and at first i always helped her finish her work as well as still helping her after i finished. We used to go out but somehow stopped and after sometimes she completely switched up on me and i haven’t done anything? I was always nice to her. She kinda avoids me now and stopped giving me lifts back home with the excuse of her door handle being broken. Tonight there was a staff party and i wasn’t going to attend if she wasn’t there as she assured me she wasn’t going because she wasn’t interested. Today i show up at work and she had her hair done and i was like okey weird but that doesn’t mean anything? After i get back home from work after again helping her finish faster she randomly dms me and says “oh yea btw im going to the party im so nervous” . I was completely saddened by this as i felt completely betrayed. I don’t understand what i have done to deserve this. Any tips on how to deal with this?🥺