Remember prior to c. Jan. 1, Cruz kept saying how great it was that Trump was running for president as a Republican and how the party needed to listen to him. Then Trump turned on Cruz, and Cruz was never again the same. He must have never expected the break to wound him so badly.
“Then Trump turned on Cruz”
IIRC, Trump didn’t “turn on” Cruz until Iowa after Cruz took the first shots. Shot #1: Cruz sent bogus notices to citizens to intimidate them. Shot #2: Cruz “fixed” the election by lying about Carson dropping out of the race. Trump never takes the first shot.