See bloomingmarvellous and Her underlying insecurities and vulnerability.
Rob has spent the last few years chipping away bit by bit at her confidence - and she was so desperate to be in a loving relationship.
The worst scene for me was ages ago, with the dinner with Adam and Ian. She had prepared something, Rob marched and said 'oh don't be silly and went out to buy steak' then made comments about how much she was drinking all night.
It was all very subtly undermining and has been ramping up ever since. If he'd been like that from the word go old Helen would have told him to shove it.
That's why coercive control is so damaging. It's difficult to spot and also one is largely complicit in it.