Maybe because it's tabloid trash and even though it is almost certainly complete BS, Trump supporters (such as yourself) want it out there because they hope it will tarnish Cruz even though it highly unlikely to be true.
Too bad for you Trumpsters this isn't likely going to have any effect at all, and may just look like more attacks from Trump supporters on Cruz's wife garnering him sympathy and helping him defeat Trump in Wisconsin (second poll out today showing Cruz beating Trump in that next primary state).
Trump and his allies appear to be getting a bit worried his nomination will be derailed.
There are more than 8000 articles from NE still on FR. What’s the consistency then? Other sources are corroborating the story. As much as you wish, this IS a real story that so far, no one has denied.