Cruz started throwing crap about Trump in his closed door meeting. Prior to that Trump never said a negative thing about Cruz. Try reading all posts and you will find the Cruz supporters call more names and trash anyone who doesn’t support Cruz far more often than the other way.
I don't know what closed door meeting that you are referring to or the date it supposed occurred. Trump has insulted, mocked and called his opponents names since Iowa. Cruz has not descended to Trump's level- he points out Trump's inconsistencies and the impossibility of making his policies work. That is certainly fair game. It would be great if Trump stuck to policy rather than nasty attacks.