The limitations of an educator

One of my students is heavy on my heart. I have known him for 4 years. I met him when he was in first grade. Now, he is in fifth grade (obviously, for those of you who can add in your add). I remember him as a quiet kid. He had difficulty answering yes/no questions. A different student in his group received a lot of my attention, since he was 30% intelligible. I remember trying to make up for that when the student was in third grade by working with him one-on-one for a while to help him make progress and, well, it would only encourage him to participate.
As a first grade student, this kid would just sit there in class. Some attention deficit disorder but also no motivation. This remains a concern. He doesn't like anything and doesn't care about anything, either. Yes, he likes video games, but if it means he has to do homework, he's fine just sitting in his room and staring at the wall.
He has been participating in his speech group this year. Participation was never a huge issue, but it has definitely improved. I have been surprised by his right answers and proud of him for seeing him make connections with acquired knowledge.
Today, I yelled at him. Well, I spoke louder than usual. I by no means yelled, but I was angry. Angry, because I care so damn much. So angry I didn't even know what to say. My student may not care about his future, but I do, and I will care for him, if I can.
He had told the paraprofessional who leads his resource (specialized academic instruction) group that he didn't want to do his work today; he'd do during recess on Monday. That is not the kid who participates in my speech group. It's not out of his character, but his indifference is rapidly increasing.
So, I (loudly) asked him why he wasn't working. He shrugged his shoulders. I responded, if you don't have a reason, then you're going to do the work. I told him he was smart and how I enjoyed working with him in my group. When I left the room, he was walking over to tell the resource specialist that he was going to complete his work on Monday.
My plan is to observe his group on Monday and to pray to God that during this child's life, he will start to care and want to learn. God may or may not use me, but I trust He has a plan for this child.