Keep helping him to learn but my mother knows a family with two children both labeled as gifted at an early age and both of them find it hard or impossible to make new friends or face new environment without throwing tantrums (6 + 9), this is because the children were often kept alone learning things. I myself was labeled gifted at 8 or 9 but I didn't enjoy being taken out on my own.
Keep helping him learn but don't try and force him to live on brains alone, hep him be sociable and kep letting him play witjh other children, A good idea is too find a child slightly older or not who is also bright enough to keep with your son and have them play together often this will improve his sociability and could potentially be enducational for both of them.