Question

Why did the Colomber pursue stefano his entire life

Answer 1

The colomber was trying to give Stefano a glowing pearl. The "Perla del Mare" brings good luck, power, love, and peace of mind. Stefano then confronts the colomber, who explains that he has not been tormenting him but trying to offer him a pearl of the sea. Two months later, a boat washes up on shore with a skeleton grasping a small stone in its hand.

Step-by-step explanation:

Answer 2

The reason is because the colomber wanted to give him a pearl from the sea.  This pearl was called the Perla del Mare which brings gives the bearer good fortune. It was not his intention to torment him in any way.