There is a war memorial constructed in Sri lanka as a testimony of gratitude by Lankan,so you should better ask the question from a LankanWhere does it say Pakistan is a certified Terrorist State?
India herself has admitted that she has been using "proxy forces" in Pakistan and Sri Lanka such as Mukti Bahini and LTTE. By your argument India should be declared Certified Terrorist State.
India is a relative, China a friend: Mahindra Rajapaksa - The Times of India
And regarding Mukti Bahini nobody except Pakistan calls them terrorists matter of fact their leader Shaikh Mujeeb fought for an independent Pakistan more than you.