Sorry if this gets confusing....
Wife's cousin came in 2017 on a tourist visa and was staying with us. She started dating a guy and they eventually got married in 2018. They filed for AOS and she received her conditional GC in September of 2019. She should be filing for ROC at the end of June. They've had a rough go of it from the beginning, but I believe the marriage was in good faith. Due to his finances (don't buy bitcoin on your credit card) they have been living with his parents since they got married. They don't have that much in the way of assets or finances to conjoin. They recently relocated with his parents to another state. She had hoped a change of scenery would get him to be a bit more independent, but that really hasn't happened. He is now questioning if he wants to go through with helping her file for ROC and has brought up that he is thinking about divorce. He doesn't want his parents to be on the hook for her support if they do get divorced (he would need a cosponsor), which I do understand.
My question is as follows: I know that a 751 divorce waiver requires proof that divorce proceedings have begun, but what do you do when a spouse does not want to file for ROC but no divorce or separation has actually occurred yet? (Support is not an issue, as I am willing to be her sponsor)
Also, what are the legal/ethical issues if they were to file for ROC knowing that they would be divorced soon after. (In this case I would still be the cosponsor)
Thanks for your advice.