Unlike Mowgli, Dina didn’t leave the jungle willingly and was rather forced back into human society
Even though he was forcefully brought back to society, he never managed to meet the expectations of those around him. After spending the first 6 years of his life living in the jungle, it was simply impossible for him to rewire his brain and turn into a real human being. So, for the rest of his life, he continued to be this fascinatingly tragic being he had been conditioned to be.