When does it turn from a new relationship to an abusive one? How does that happen and why it's never as simple as 'why don't you just leave?'
Links to the literature on the subject and resources:
http://www.nationaldomesticviolencehelpline.org.uk/
Books:
Why does he do that - Lundy Bancroft
The verbally abusive Relationship - Patricia Evans
Look what you made me do -Helen Walmsley Johnson