Watched my husband drive away

I have been with my husband for 31 years and married for 22. I love him with all my heart but his mental issues and my stubbornness have made us unhappy for a long time. Today I went from wanting him to go to sobbing uncontrollably. I know it is the best for both of us but I have never lived alone before and am worried about taking care of everything myself and being lonely. I am going to help him financially for a while so he has every chance at being happy for once in his life. We plan to remain friends. I guess I just need some encouragement. 💔❤️