And how he didn't step up as a producer and tell her what was going on with Bentley. In hindsight, I think that is what he wants to do different this time; not let a bad situation fester.
When Samantha left, Ben said it was the girls who said she wasn't there for the "right" reasons. I think producers were the girls as Samantha had targeted one of their own and this is how they could get rid of her.
Every season they learn something and some of the same things that happened before are handled differently.