Why would a guy just randomly ignore you out of nowhere?

That's what I do and It's mostly to drive women crazy, yet I do everything to make you feel special one day then I might not ignore you but avoid you for a few days or a week, yet I would never be insulting but very gentlemanly about it, It a way to make the girl work for it, I just like mind games and to do this on many women, BUT I just do this for the ego-boost.