Celibacy of Priests

To Love A Priest Victor S E Moubarak ISBN-10: 1505908558 ISBN-13: 978-1505908558 Forgive me dear readers for returning to the subject matter of my latest book "To Love A Priest". As the title suggests, it deals with the question of celibacy of Catholic priests.
It has long been a ruling in the Catholic Church that priests should not marry and must remain chaste throughout their lives. This is a vow men make before they are ordained to the priesthood.
In the small town where I live I have known three Catholic priests, good priests at that, who had to leave the Church to get married and have a family. I also know another priest elsewhere who did the same. I am sure you've known of priests or nuns leaving the vocation for new life outside the Church.
I've often wondered how serious a sin, if sin it be, was committed by these individuals. They decided at some stage in their lives that they could no longer follow their vocation and keep to their vows. Is this sin, I repeat, if sin it be, unforgiveable and they are doomed for eternity? Is it a sin that can be "confessed" and forgiven albeit they remain married outside the Church?
How different is the breaking of a vow of celibacy to divorce and breaking the vow of marriage? Are the many divorced Catholics doomed for eternity, whether they re-marry outside the Church or not?
In the small town in which I live I know of one married Catholic priest with a grown-up family. He is a good priest. He was an Anglican priest but left that Church to join the Catholic Church.
How does the Church and our Bishop view him compared to a celibate priest? More important, how does God view both priests? Does He love them both for doing a good job in His service?
Jesus never asked His followers to be celibate. He chose Peter, who was married, as His first priest in His Church.
Is the Catholic Church missing out on good men by insisting they remain celibate?
My book, whether you read it or not, covers all these points in, I hope, a delicate and compassionate manner. It is a "good read" - or so I am told.
I would, however, welcome your views on this subject in the comments box below.