It is worth looking into and working out with him. Keep in mind that kids are
slow to trust others....You will need to earn his trust first. Could be a lot
of things in his life right now.... parent issues, loss of a girlfriend, a
buddy, even a car, or low self-esteem , and maaaaaybe he's experimenting with
drugs. Observe his behaviors.
Is he repressing anger over something? Anger at himself? Does he have an
"aught" with you due to a misconception? Is it acting-out behavior because he
is"mad" at the school, his life in general. Has he had a recent
disappointment? I know that some kids make it a career to be a "pain".
I'm not talking about them. This kid was an A student, so something is out of
whack here. See if you need to cut some slack and help the class understand
that you have a definite reason to do it, without breaking privacy.
Let's not put our rules and subject first. We teach Kids, remember? I am also
an RN and they drummed into my head in training, that we have a "patient in
the bed" not machines and human anatomy. Also, in the classroom we have a
warm, breathing human being that may be needing encouragement.