Donald Trump is a man who barters and deals. You can't do that if you can't keep your cards close to your vest. You can't succeed at such a life style if you can't string people along occasionally.
We jump around jumping to conclusions about elements and strategies employed and miss the point that it's the final outcome and the profit alone that makes for a successful deal.
Deals that look they have one obvious goal often are aimed at the success of two in the bush and then another.
You also don't want to assume that you're going to get anywhere by being virtuous or sincere in your relationships .... with anyone .... it simply would be counterproductive. You can wish your opponent well and not be vindictive ... but that's about it. Speak softly and carry a big stick sums it all up.