Why i think this two are just fooling people that want to be fooled is this;
1) No one is that friendly with an ex (that's if they truly dating back in 2013)especially people their age.
2) Since the beginning of KUWTK we've never really seen kendall dating (like in a relationship) anyone. We don't even know if she's into men.
3) They look more like friends in this photo. There could be a possible attraction but it might be one-sided. If not why is it not working already?