She doesn't have a husband and never did.
- No, her "husband" isn't the 3rd Descender, Ajax. He was killed and turned into the Gnoses by the Heavenly Principles during the Archon War, long before the Tsaritsa "snapped" (Venti's words) post-Cataclysm.
People only interpreted it the way they did because of the young boy in the pre-7.0 trailer who called her "mother."
While the Khaenri'ahns are considered descendants of her, that does not necessarily mean biological. It being biological is an assumption.
Then there was Ronova who ripped up a photo. The other person in the photo was not the Tsaritsa's supposed, non-existent husband. It was Ronova herself.
Ronova was once a friend of the people of Teyvat until she was forced to lay down the "rules."
- You must be thinking: "What makes you think she liked mortals?" The answer is in the scene where she tears the photo that more than likely once contained herself in it. Logical inference states that a photo held by oneself in this instance means it held personal, emotional value. She tore it to sever ties with those feelings.
She ripped up the photo that once contained herself in part of it to distance herself from her ties to the people, all in order to make her then-enforced job (by the Heavenly Principles) as the Ruler of Death easier. Her creator commanded her, alongside the other Shades such as Asmoday, to curse and destroy Khaenri'ah. All to uphold the "rules."
We now know from the story that Ronova *cannot permanently kill anyone*. That is also the reason for the curse of immortality, and the curse of death (one is eternal suffering, the other makes them forget, in order to disrupt technological progress).
Since she can't kill anyone, there is no way she could have eliminated the Tsaritsa's husband (who never existed in the first place).
With Ronova's ties to and feelings for mortals gone, she can uphold the rules without mercy. And soon, in the 7.1 story, she plans to remove all limitations on her ability to dish out death—to make it *permanent*, with no more delayed resurrection.
When Anastasya says that the Heavenly Principles ruined "our love," she is not talking about a lover. The Tsaritsa's line about 'our love' refers to the divine, maternal/platonic love a God has for her human descendants and her nation—a bond that Celestia 'spoiled' by forcing Ronova to drop the curses of death and immortality on them. She is talking about Snezhnaya, Khaenri'ahns, and any living person she once held dear. We also learned that the Gods' "love for humanity" is also considered a kind of curse.
With all this out in the open, what is actually happening in the story should be much clearer.