Because people change their minds about things...and I don't know! Maybe you were shy about it, or you were busy or didn't want to be seen signing yourself up. There are lots of reasons people might not want to do it themselves. Someone texted me privately even because they didn't want to do it in person...

[Kuzuryuu cut her some slack. She's twelve and also hasn't known you for that long yet. She's still learning!]