Christ did not require his apostles to be unmarried.
Before the Resurrection, there weas one Apostle in particular whom Jesus the celibate especially favored - John, the celibate among the Twelve.
He appointed only one Apostle after His Resurrection.
Saint Paul.
Saint Paul was also a celibate and a strong advocate of celibacy, sanctioning marriage only as a last resort.
As the testimony of the early Church attests, after their ordination married bishops customarily lived with their wives without intercourse just as Saint Paul advocated.
I will point out that the teaching of Saint Paul is also the teaching of Jesus Christ.
Jesus "requires" celibacy of no one. He asks those who embrace the ministry to embrace it.