There was this girl in high school that constantly gave IOIs to me during our senior year. I always put her aside though and played really dumb due to our social circle (stupid high school stuff, i know). She texted me out of the blue a couple of months ago, but she got nervous at the last second and flaked. I believe she got nervous more than I believe she isn't interested because we have a mutual friend (whom she doesn't know that I know) who told me that she was too nervous.
I pretty much told her I don't tolerate flakeyness and that was the end of that. Recently I've been getting bored and I'm probably going to text her something. I'm just trying to think of the least needy thing to say or what you guys think of this. I was just going to say something along the lines of "Hey ghost, long time no talk!" or something stupid like that.