Do you consider planning to have sex, cheating?

So say you have an ex fiance and a girlfriend. You've been with the girlfriend over a year now. You keep telling her that the ex fiance is just a friend and doesn't mean anything to you. So then the ex fiance proposes that you have sex again. You decide that you want to have sex with her and you want her back. So you plan when to hang out and have sex. Then you dump your girlfriend and go have sex with your ex fiance. Did you just cheat?