One serious issue we had was that he gave me an STI. He had rationalised that he had a very limited risk of having an STI so despite my repeated requests and despite being informed that a previous partner had been infected, did not get tested.

If only there was a simple magic word that transferred control of one's own sexual health into one's own hands. Like "No", for instance. For creative emphasis or in response to repeated attempts to initiate sex despite refusal to honour basic safety requests there are alternative expressions of refusal such as "You want to put that filthy, infested thing inside me? Eww, gross!"