“I always knew that if a person remarries for whichever reason, he may not be buried near his first wife when he dies.”
IMO, this is incorrect. my beloved father, A’H, remarried twice after my beloved Mother, A’H, was niftar. he is buried next to her (my Mom).
I am re-married & you had better believe that I am, iy’H after 120, gonna be next to my (now) husband, the father of my children. (and, my husband is not gonna be buried next to his 1st wife!!)