He's not exactly a paragon of evangelical virtue or family values. More here and here. It wasn't the press that initiated the scrutiny into his marriage, it was him and his former wife. (The paternity test was negative.)

Neil says he didn't discuss his decision with his family before telling CNN about it. Perhaps not surprising -- when he remarried in 2004, neither Jeb nor GW attended. (Either did his daughter.)

Then there's this from 2006.

What's in it for Neil Bush? If he raises $500k for Cruz, he gets to be on the national finance team. Cruz' campaign put out this pamphlet in 2015 about how it will reward top bundlers. Here's a summary of what Neil stands to get:

[...]an invitation to a special retreat with Cruz and his wife Heidi, as well as an invitation to a quarterly dinner with the couple at their home. This top level of fundraising is considered the “Founders” level.

Raising half a million dollars will also provide the fundraiser with regular campaign leadership reports and give him or her a VIP Republican National Convention package that includes a hospitality suite and VIP reception at the convention. The bundler will also have access to host committee receptions to events in their home state.

Sounds like the financial equivalent of a groupie.