One has surely got to wonder why! In her defense, she does have a very intriguing reason.
In the case of Dhoom 3, Kat did not accept the offer to begin with - quoting date clashes. On the other hand, she did give an initial nod for Ayan's project, but later withdrew claiming yet more date issues. Apparently, it all stems from Kaif learning about Salman Khan suffering from a nerve disorder which is being treated in the United States at the moment.
Whether her concern finds inception in the capacity of being his ex-flame, or still a good friend is debatable; but Katrina is sure going out of her way to ensure she keeps her dates open for whenever Sallu is up for shooting for Ek Tha Tiger.
Her concern has taken a suspicious form of worry, which is reflecting even in her promotional campaigns for upcoming release, Mere Brother Ki Dulhan. The actress is heard to be having a hard time keeping pleasant public appearances for the same.
They may have parted ways, but Kat and Sallu have mostly shown admirable amicability towards each other even post the split. Is there a chance of reviving what they once had?!