I'm not so sure, I think to Trump it's all a game. It's business. You say horrible things to gain leverage, to disrupt your adversaries, to stir the pot. But when it's time to make the deal you shake hands and sit down to a cordial lunch together, all that forgotten. Just a show.
The evidence against that is his ongoing taunting of Jeb Bush. Jeb is done but Trump still keeps kicking him. So there seems to be some sort of grudge there, I'll grant it. But in victory Trump has otherwise said nice things to and about Cruz. Just not in the arena.
Trump is overdoing it.
Cruz is closing all the deals to unify the party.
I bet you a Trump steak that walker is next.