In the morning I asked a girl out to a concert that would be held in the same evening
She said "I'll call you if I come.What time is it?" .Some bullshit answer, since every fucking human being would notice that I had to know if she comes or not, so I could make other plans.

I replyed "At 20:00.Don't call.I'll go with someone else if you dont know if you can come, it's ok "
on a friendly vibe.
She than said "Ok.Go with someone else )) " (facebook)


Is that ok for an answer(mine)? was I uncounsciously needy or she could have felt that I tryed to show off I could go with some1 else?

It's a little vindictive and likely won't get you anywhere with this particular girl.

That's a bullshit response from her, however. Not really helpful.

Better, when you asked her, may have been to have a discussion when she told you she'd message you if she could come - and say "well I sort of need to find a replacement if you can't make it, so maybe you could let me know sooner rather than later"...

From the sounds of it she's not especially interested anyway, and you'd have gotten a 'no, sorry, can't make it'... but at least you'd have known.