Thank you for the added information. It helps a lot. I believe I can now be of help with this issue.
First, let me say you are clearly a very caring parent and your son is very fortunate that you are this sensitive to your children's feelings. And this is actually the key to my answer to you that you need to consider and think about.
Your son is somewhere in that gray area between being fine and going about his early adolescence easily and being troubled and needing professional help. He's not quite in either camp and that makes it very difficult not only to assess the best course of action but to take coherent and useful action.
Do you see what I'm referring to here? I think this is your dilemma actually and I see it as well. He's still doing well in school but there is an air of negativity and lack of enthusiasm in him at the same time. So he's not doing badly and therefore clearly needs intervention and he's not doing great emotionally. This is what I mean that he's fortunate you're there for him because you are noticing this.
I can tell you that my policy with kids when it's an emotional gray area like this is to not push for professional intervention right away. Your son is now old enough that I think you can talk to him openly to some extent about what you're noticing--as long as you're not too strong in your language and not too emphatic. Teens have a hard time with that if they're going through things emotionally. But if you approach it in a straightforward way and then ask him if he would like to talk with a psychotherapist, that would be the only reason at this time to seek help. BUT you must keep a very watchful eye, even as you keep a positive attitude. You want to not let the grades go down much more and his attitude to become really anti-social before you would take a more active role in encouraging him to speak with a professional. Okay?
I'd like to also give you a great resource for working with your teen. Here is a book that is excellent. How to Talk so Teens Will Listen and Listen so Teens Will Talk by Faber and Mazlish. Here's the Amazon web page for it:
These two authors are students of Chaim Ginott. He was a wonderful psychologist in the 1960s and 1970s. He's not permissive, he communicated! You might want to go to his book for non-therapists: Between Parent and Teenager. It's old, but still relevant. Here's the Amazon page:
Okay, so keep monitoring his situation and talk with him. I wish you the very best!
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