Is it legal for my husband to put me on his insurance even though we live apart?

My husband walked out 3 years ago. The house was in his name, so I moved closer to my job. At no time during our marriage did he have me on his health insurance (when he had a job that offered it). Now, since I am too rich (ha) for Medicaid, he wants to put me on his plan. I am a diabetic, I guess he feels guilty. We are still married. I don't have the money for a divorce and he does not want one. He lives in another state with his girlfriend. I cannot qualify for any subsidies because I am still, of course, married. If he filed for a legal separation, could the court compel him to provide insurance? Does it matter if we live in different states?