There was a time when I was so solo oriented that a buddy was just a technicality that slowed me down and wasn't appreciated at all. Don't get me wrong, I still dive solo a lot and sometimes it is the only way that I will do a certain dive.
However, with the mentorship of some much more experienced divers, I have learned of the importance that a good buddy can play during a dive. I was scolded more than once for disappearing on them during a dive and never really understood what they were getting so bent out of shape over. Heck, I was fine and there were no problems and they were more experienced than me. It wasn't until I began to understand that they were not worried about themselves, but rather about me and not knowing how I was doing. Cave training and buddy awareness has also helped me with this issue. I now use the saying from Top Gun - "I will not leave my wingman". If he goes off the line, I will be right there beside him. No matter the reason, I will not leave my wingman!
Imagine having to live with the question of "what if" after a fatality.