Follow the trail of evidence:
Marco Rubio’s campaign shopping the story around.
‘Anonymous’ (the hacking group) threatening to expose Cruz approximately 10 days ago if he didn’t drop out.
That should get you started.
Here's why I tend to believe it: Cruz has been playing Constitutional Conservatives as our guy since he got to the US Senate. Then, all of a sudden, Cruz turned totally against Trump in vicious ways, put Neil Bush on his team, made a whole lot of other moves that seemed to be licking the boots of the GOP elite. Was it because he was trying to keep the story quiet by being the perfect slave to their world view and a promise to destroy Trump? It's the only thing that makes sense.
I'm disgusted that there was no IMMEDIATE outrage about the Melania photo being used on the eve of the Utah primary. I'm coming to the conclusion that Melania's the most decent person in this whole soap opera.