It does not sound consensual
No idea about HR and whether a relationship agreement was drawn up. Maybe was, but delivered by email and rejected?why did you come and look for me again, take me to your house, and force me into sex?
Anyone who goes from allegations of assault into a consensual relationship and back to allegations of assault has got to shoulder at least some of the blame.
To me such a “consensual” relationship seems analogous to Stockholm syndrome. If you have no choice about something, you may just reframe it to something you can psychologically accept. If even after the reframe “I had to undergo the deed but we are in a relationship, or would be if he was not married” there is an expectation gap then I’m not sure the fault lies with the alleged victim rather than the figure with power.
The on-off relationship characterisation is also possible, but firstly doesn’t seem likely from the get-go, and secondly doesn’t appear to be allowed free discussion.
Think of the many accused of corruption and having mistresses and being executed in recent years and notice how selective that is, and we understand “rule of law” in China.
For some lighter relief given this distressing topic.