The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
Velasquez didn't think he could trust Cortes, yet he always gave him another chance because Velasquez could convince him to refrain to attack the powerful Aztec Empire.
Velasquez was the governor of the Island of Cuba and when he met Cortés for the first time he thought about giving him a portion of land and some slaves to farm the land. But as we know, Cortés was a warrior and had "the fighting spirit in his blood." He wanted fame and fortune and that is why he decided to sail to Veracruz with 11 ships and approximately 600 soldiers. His crew asked Cortés to refrain from invading Tenochtitlan. Gossip got to the ears of Velasquez and he sent Panfilo Narvaez and a group of soldiers to arrest Cortés.