Why is Pakistan afraid of India's influence in Afghanistan?

Pakistan considers Afghanistan as its unofficial 5th province. Pakistan wants that Kabul should always be subordinate to Islamabad.

As per Pakistani planners, Afghanistan is their strategic depth. In case Indian strike corps make a deep thrust inside Pakistan, then Pakistan forces should use Afghan soil to regroup & make counter attack. This was the reason Pakistan had installed Taliban in Kabul. Pakistan has provided Afghanistan access to sea via its ports and Pakistan wants to have control over Afghan foreign policy. On the other hand, India is genuinely helping in development of Afghanistan. India has built dams, roads hospitals, schools, parliament buildings etc in Afghanistan. India has generated a lot of goodwill among Afghan people.

Pakistan regularly supports Taliab, Haqqani Network in attacking Afghanistan. Pakistan’s hand is full of blood of common Afghan. Pakistan is afraid of Indian influence in Afghanistan. In case of Indo-Pak war, a hostile Afghanistan would be the biggest nightmare for Pakistan. India can also fuel insurgence in Pakistan via Afghanistan and obstruct CPEC. India is dead against any compromise with terrorists in Afghanistan. India wants a free, democratic Afghanistan whereas Pakistan wants a subordinate Afghanistan.

But Pakistan forgets that the Pakistan-Afghanistan border dispute is actually bigger that India-Pakistan dispute. Afghanistan claims large portion of Pakistan and Afghanistan had opposed Pakistan’s entry in United Nations. Even Pak puppets like Taliban don’t recognize the current Pakistan-Afghan border (Durand Line). So, Pakistan would never like a democratic & progressive Afghanistan and is wary of Indian efforts to help Afghans.