If one party wants a divorce, but the second party does not; can the first party still obtain the divorce?

My husband and I have been separated for over 20 years, but he has always paid the mortgage on the house I still live in and for the first 10 years we were separated he and I still were intimate until he could not be anymore. He is 14 years older than I am. We separated because he cheated on me and would not leave the other person alone, so I packed his clothes and told him to leave. He left me with a 5 year old daughter to raise pretty much alone. He proceeded to live with this other woman and have a son with her. He and I have a business together and I have done a lot for him over the years. He has also done a lot for me over the years. Now, he claims he wants to get a divorce because her health insurance would be better able to cover his medical costs. We have been married for 28 years. I don't want to divorce because I will lose a lot of "things" to her that I worked hard for over the years. Is there anything I can do?