What constitutes abusive behaviour?
The new legislation says abusive behaviour is:

Behaviour that is violent, threatening or intimidating

Behaviour whose purpose is one of the following:

making a partner dependent or subordinate
isolating a partner from friends, relatives or other sources of support
controlling, regulating or monitoring a partner's day-to-day activities
depriving a partner of, or restricting, freedom of action
frightening, humiliating, degrading or punishing a partner.
The offence is aggravated if any of the behaviour is directed at a child or witnessed by them.