Below is an incident in which an employee faced s-xual harassment from her manager at Gartner (UK). After she rejected the advances, her treatment at work deteriorated, ultimately leading to her resignation. She brought a claim to an employment tribunal, which upheld her constructive unfair dismissal claim and some of her s-xual harassment claims.
https://www.peoplemanagement.co.uk/article/1753082/sales-executive-victim-s-xual-harassment-boss-made-advances-called-good-girl-tribunal-rules
There is plenty of information and documentation on this specific case online.
If you feel you are in this "constructive dismissal" zone, document everything and it could be rational to reach out to an employment lawyer.