I assume Trump will be the Republican nominee
You may not like the fact that Cruz hasn't endorsed him yet but he has broken no vow. If after the convention, Trump is the nominee (as I assume will happen) then Cruz should endorse him. If he doesn't he will have broken his vow. I was replying to a post which indicated Cruz had broken a vow. He has not.
Lots of words nitz, much of which means zip.
Cruz is not a man of his word, to the casual observer, he is behaving like a spoiled pouting loser.