I think it depends on your family dynamics .
My uncle was still my uncle, (and I niece to him), and I still refer to him this way ( he died a couple of years ago) even though he and his wife divorced ( my bio Aunt, my parent's sibling). He will always be my uncle,and not an ex uncle.
My parents referred to him as their brother in law too even after my aunt split up with him. They kept in close touch as he was a loved part of our family. They were married for years and years , but sadly broke up after about 30 odd years of marriage .
I think of him as very much my uncle, and not an ex uncle. He is my uncle, and father of my 1st cousins ,Why wouldn't he still be my uncle?
My grandmother ( and grandfather) loved him and treated him like a son, and this didn't change when her daughter split up from him. He was still her son in law, none of my family including myself thought of him as an ex uncle, son in law, brother in-law.
It all depends on your own family dynamics , but my uncle will always be my uncle, and not an ex uncle.
It really depends on everyone's own circumstances.
Kind regards
