accidental facebook event ruined a friendship

couple of years ago i got a invite to an event on fb. it was from a childhood best-friend whom i'd recently rekindled the friendship with (before fb). we'd been hanging out again, having dinner parties together, all that stuff. was a little stocked to get the invite. pleased she was thinking of me. on the day i get dressed up & off i go to this party. her family & friends are there, most of whom i know from the years she & i spent together. they're happy enough to see me & all is well. until my friend arrives. first thing she says is 'what are you doing here?' i tell her i got her fb invite. she tells me she never sent me an invite & she's giving me that look like i'm a stalker. i know she sent me an invite though i'm standing there thinking it must have been accidental. i tell her i clicked 'attending' on the event page so she'd have seen i was coming. she tells me she can't hang around me coz she's got to mingle & i  tell her that's fine. i have a good time mingling myself. hadn't been out in ages & was happy to be socializing. check the invite later on but it's been removed coz the event has passed so can't prove to her that i'm not lying. send her a fb message, sorry for the mix up, don't know what happened, definitely got an invite, must have been accidentally invited. she doesn't reply. over the next weeks mutual friends who attended the party start deleting me from their friend list. she stays my friend, except she has a hens night & gets married & doesn't invite me or even tell me she's met a man or getting married. contact her to say congrats. she talks like all is well. never hear from her again. never contact her again. still friends on fb for some time until i notice she doesn't like any comment i make on her page while liking everyone else's. time to nip that friendship in the bud. and all because of an accidental fb invite.