How was Saint Jude Thaddeus a good man?

Yes, Jude was a man and one of Our Lord's original twelve apostles.

Since St. Jude died as a martyr, beaten to death and then beheaded, the early Christians declared him a saint based on the martyrdom he endured.

Jude was neither beatified nor canonized as the process of canonization was not put into place for over 1000 years adter his death. He was declared a saint by the early Christian community.

Tradition says that Jude was born in Paneas, a town in Galilee, later renamed Caesarea Philippi by the Romans.

There is no record of the birth date of St. Jude. However, he was probably born in the same general time frame as Our Lord Jesus Christ. It is thought that he was a cousin of Our Lord.