Ok, so there's this girl...?

ok, im 15. i went out with her in april and we both decided to break up becuz we nvr saw each other. i asked her out again and she said yes. now i realize that i dont like her, i cant figure out why. i mean, i liked her before i asked her out...anyway, should i break up with her??? and if so, how do i break up with her after already doing it once?