Jesus man why are you still in 'game mode' with a girl you've already had sex with?
Honestly that type of long text doesn't mean much or change anything as it's perfectly normal when you're young to not want anything seriously heck I'm 28 and still figuring it out though I have a good idea.
I would almost just ignore the text myself, but something simple and neutral like 'we'll see

' or 'lets go out tomorrow

' is fine... I can tell you I have no problem bedding women and it's because I don't type out long text or text a particular girl every day anymore and am just positive/neutral and brief in my texting. If they are available for me then they are, if not, then I'm on something else! Gone are the days I type out feelings on texts.
I was out with a good friend of mine and this dude was blowing up her phone while we were out. She showed me other guys in her phone that she was talking to these long stupid texts and told me how annoying they were!