Well that girl must have really liked you, because your "pretending" of teasing her is far too serious, even if you display strong values by acting this way, the goal of push-pull is not to make her uncomfortable or think that you are way too serious, but rather to tease her which conducts to easyer escalation... but your strong behavior obviously builded attraction... so why not
But the reason why she stopped was most probably because you didn´t work enough against her Last Minute Resistance. If she now says that she doesn´t want to be your gf, you screwed it up already ealier before coming to fclose...