Music aside, I don't think Paul and Jane were compatible. Jane was ambitious and had her own career which was one reason I liked her so much. She was also still young, 23 when Paul married Linda, who was, I believe 29. Paul wanted a woman who would center her life around him and the family. Jane wasn't ready to do that. Linda and Paul were soul mates I believe. And she was the one who introduced Paul to his concern for animals and advocacy for animal welfare. Linda managed to continue her career as a photographer, followed her avocation as an animal rights crusader, vegan cookbook author, and company founder, as well as being a great wife and mother. Linda also contributed to Paul's music in her own way. I identify more with Jane in her life choices but I admire Linda and what she accomplished in her life, greatly.
I saw Jane onstage in London. She is an amazing actress so I'd say all's well that ends well.
Paul would have written beautiful love songs regardless.