Well, considering he spent so much time attacking Cruz, again, after the convention, instead of acting Presidential and talking about real issues important to the nation, this does not bode well for the future of the Trump campaign.
Trump is, obviously, the kind of a person who holds a grudge for an abnormal period of time, which is anything but leadership.
He is spiteful and vengeful, and this is becoming more and more clear as time goes on, and what else is becoming clear is that Trump really does not have a grasp of the issues of the day, in America and around the world.
He would rather spend time attacking those Republicans who for good reason will not support him and who criticize him, e.g. Cruz, Ryan, McCain, than engaging in substantive debate and discussion.
If Trump does not do an about face, and start acting like a serious Presidential candidate, and not like some petulant fifth grader in a school yard, and soon, his campaign is doomed.
That ship has sailed long ago. Trump realizes he is in over his head and I think he wants out. He just requires a pay-out for his "sacrifice". Hopefully Ryan, Priebus & Co. will see that, and act accordingly.