Yes, he was testing boundaries. In The Gift of Fear, he explores this aspect of relationships.
The CPS Crown Prosecution Services know you'll find it difficult to come forward. Have a read of their website. You might find it reassuring.
www.cps.gov.uk/legal-guidance/domestic-abuse-guidelines-prosecutors#a90
Your statement is evidence. I've been scanning the Crown Prosecution Services website. They know coercive control is done is private and difficult to prove. They have checklists for evidence. This is the coresive control checklist
Checklist: Spotlight on controlling or coercive behaviour
In addition to standard lines of enquiry, officers investigating a potential offence of controlling or coercive behaviour under section 76 of the Serious Crime Act 2015 should focus on identifying a pattern of behaviour across different types of evidence. Much of it will be evidence of the victim and perpetrator’s day to day living and their interaction.
Types of evidence which may be useful include:
records of communication between the victim and perpetrator, eg, emails, phone records, text messages, social media
audio or visual recordings of interaction between the victim and perpetrator, demonstrating body language and tone, eg, 999 recordings, CCTV, BWV footage
local enquiries, eg, neighbours, regular deliveries, postal services, window cleaner
witness testimony, eg, from family and friends, as to observed behaviour by both parties and its effect and impact
diaries kept by the victim and/or children
records of lifestyle and household, including photographic evidence of the scene
evidence of isolation, eg, lack of contact with family and friends, withdrawal from social activities and clubs
records of interaction with services which show the perpetrator adopting a dominant role, eg, always accompanying the victim to banking or medical appointments
bank records showing financial control
medical records
GPS tracking devices installed on mobile phones, tablets, vehicles
care plan, where the perpetrator has caring responsibilities
These are not exhaustive and any evidence which shows a pattern of control or coercion is relevant.
See Home Office (2015) Statutory Guidance Framework and Crown Prosecution Service (2015) Controlling or Coercive Behaviour in an Intimate or Family Relationship for further information.