More like Trump gave Cruz a lot of rope, Cruz crafted a perfect noose, and committed political suicide on stage. Perhaps Trump planned it that way to permanently deflate any future Presidential aspirations for Cruz. Stupid versus brilliant....the art of the deal to let your opponent self destruct.
I see your point. It was really a no-lose situation for Trump, to hand Cruz the rope. Either Cruz would hang himself and help Trump, or toss it aside & help Trump.