Let this be a simple but very important lesson about life. Do not give out your word lightly. If you break your word you almost always undermined your credibility. Men and women of all types will notice and remember when you break your word. Most will never forget, even over small items. Women in particular lose interest in men who say they are going to do something and then do not do it.
Cruz specifically gave his word here and even worse tied it to his political career. By not endorsing Trump he broke his word, and not only did he break it, he did it when invited to Trump’s party and symbolically peed in the punch bowl when he did it. This is not honorable. Honorable men do not do this to each other. Even Jeb! had enough sense to stay away and shut up.
If you don’t know the details of an arraignment or you have doubts, don’t give your word. If someone pressures you it’s typically a very bad sign that you may have to break it later. Be a man of honor, don't break your word and don't give it out lightly.