[FuzzyPlum]

Yes, of course he should have helped her. They wanted and needed success... What was good for her, was good for the band, which was good for him.

... However, what he should have done, and what I'm sure he regrets is not insisting on being properly credited, both as a songwriter and as a producer. He should have put his foot down and insisted on getting recognition. Words by Stevie Nicks, music by Stevie Nicks and Lindsey Buckingham.
....yeah, perhaps he deserved sole credit for the music a lot of the time... But maybe that's one argument too far.

If he had proper recognition for her songs and the production, he'd probably be viewed differently now relative to her success.