He welshed on his signed marker to endorse.
He put himself above the country by not helping to defeat Hillary.
His speech was rambling, maudlin and he went over his 9 minutes time to speak for 22 minutes and utter no cohesive message, nothing except buzzwords. The crowd gave him every chance to rejoin the party for the good of the country and he went over the cliff in typical tone deaf Cruz fashion.
For you to be proud of him I must assume you are his mother.
True.
He simply could have said that despite some differences between himself and Trump, that the nation must unite behind the Republican Candidate (Trump), and that he therefore was endorsing Trump.