Young (early 20s) newly baptized man marries well-to-do and well-connected within the JWs early/mid-40s widow. Whirlwind romance: engaged within a week of meeting, married a month later. Their child is born within 10 months of the wedding.
Young man benefits from the sugar mama effect (house is paid for, she dotes on him financially, sets up a business for him) and gets to hobnob with COs and DOs due to her inner-circle position within the JWs. Young man travels very quickly up the Privileges™ scale and before you know it, he's Presiding Overseer™.
They both continue to age, and by the time he's in his early 30s, he has gone through a couple of failed business ventures (on her dime). Her father - who has been living with them for many years - passes away and leaves her a healthy inheritance.
They decide to move cross country to be closer to his family, which isolates her from her adult children and grandchildren.
She comes home from Serve-Us™ one day to discover that her knight in shining armor has moved out, moved all their possessions out, and cleaned out the bank account and moved in with a woman his own age - a former flame whom he had known before he converted to the JWs.