Did zabuza care for haku

he is not really like zabuza,haku has a softer and nicer apperence than him he also is very kind so kind that he was not able to kill anyone unlike zabuza who was a real killer machine,haku has always told that zabuza was the most important person in his life while he said that haku is yust his tool but when haku dies it was seen that he loved him as much as haku him....ps(not to confuse you i mean love in a familyar way ok)