See my post. If Trump wants Cruz as veep, he wants this question cleared up. They have six months. Don’t fall for the media crap. They are in this together.
Trump could play this numerous ways, depending on what his motives are.
Way 'A', if he wants to vet Cruz for a potential VP, would be take do so privately directly with Ted, and make a plan that does not burn any bridges, for Ted, nor for Ted's supporters.
Or, Way 'B', by burning bridges. As he is doing, but going very public, daily, with constant jibes.
It's more like, to me, Trump is trying to blow himself up.