Meursault's Unique style of Communication

In my opinion, Albert Camus has done an amazing job of communicating the character of Meursault very quickly, and efficiently. Even without looking at his actions, or what he says, we can gain a significant insight to how he thinks, and how he relates to people. The real meat of his character is displayed in how he communicates to others in the story, and with us, the audience. When reading, I noticed that Meursault rarely ever quotes himself, and when he does, his quotations are limited to two words at the most. This starkly contrasts the more normal quotation length seen with all of the other characters. He quotes himself on yes and no, but little else. When he wants to communicate to us that he has something longer to say, he merely summarizes, much as if I were to report this post as "I explained my standpoint to the internet." This style of communication shows that Meursault feels that he can't be bothered to extend himself to try to actually converse with others. His use of short simple sentences to relay the rest of the story also helps to reinforce his tired, aloof personality that his actions have also established. With all that being said, I think it will be interesting to see what caused him to be the way that he is. I feel like his behavior goes beyond that of the standard introvert, and delves closer to the realm of nihilism. He avoids giving his girlfriend a clear answer as to whether or not he loves her. He reports that visiting his mother when alive, or going to her funeral is a pain. He seems to feel nothing for one of his mother's closest friends as he struggles to keep up with the funeral procession, as the heat mercilessly beats upon his old withered frame. The list goes on. Something appears to be off.

But, now I must ask, is this really how he is? He gives us the short summaries of what he says to people, but are those enough to gauge how he says what he says? Going back to my previous example, it's very obvious that the statement in quotes doesn't come close to really explaining what's going on. This story is told in the first person perspective, so Meursault is the one telling us the story. He controls what we see, and he tries to give us the same impression of himself that he has of himself. It could be that he has very low self esteem, and reports himself as being this kind of careless aloof person when in reality he's actually very caring. We see that he has problems with himself early on. He feels guilt over trivial matters, and beats himself up over smaller matters. There are two sides for every story, and in this case, we're getting Meursault's. What are we missing? Does Meursault provide an objective description and portrayal of himself, or does he twist things for reasons unknown to us as of now? Does his style of communication communicate anything else? Am I grasping at straws?