They seem to have undergone a divorce. After his high-minded refusal to endorse Trump at the Republican convention (“Vote your Conscience!”) he came out today and endorsed Trump after all. This despite making a lot of pithy (and true) observations about Trump earlier in the year:

It all culminated in a blistering press conference in May when Cruz went off on the then-GOP frontrunner.

“This man is a pathological liar. He doesn’t know the difference between truth and lies. He lies practically every word that comes out of his mouth,” Cruz said.

He continued at that press conference by calling Trump “utterly amoral” and a “serial philanderer.” And he asserted that Trump is “a narcissist at a level I don’t think this country’s ever seen.”

During the height of their primary battle, Trump branded Cruz “lyin’ Ted” and threatened to “spill the beans” on his wife.

Cruz defended his refusal to endorse Trump at the convention the following day:

“But I’ll just give you this response: I am not in the habit of supporting people who attack my wife and attack my father. That pledge was not a blanket commitment that if you go and slander and attack Heidi, that I’m going to nonetheless come like a servile puppy dog and say, ‘Thank you very much for maligning my wife and maligning my father.’”

It appears, however, that Cruz is fearful of a primary challenge in 2018, with good cause:

Cruz’s unwillingness to support Trump has become an issue in his home state as he prepares for Senate re-election. The morning after he refused to support Trump at the RNC, the Texas delegation breakfast broke out into chaos as delegates split over whether or not Cruz should support the nominee.

Since then, Rep. Mike McCaul (R-Texas), a possible Cruz primary challenger for Cruz’s Senate seat, has been using the senator’s unwillingness to support Trump as a means of attacking Cruz.

McCaul attacked Cruz on the Laura Ingraham Show this week for breaking his pledge to support the nominee, declaring he was “very angry” about the dissension.

“He broke his word,” said McCaul, the wealthy chairman of the House Homeland Security Committee.

His principles appear to be flexible.