As said by
@Kim Philby "Pakistan application" is just a decoy for Chinese. China doesn't want to look bad in front of the world.
While India was busy with the Jaswant-Strobe talks right after the nuclear tests, Pakistan was busy with the military coup & sanctions.
While India entered into a defence agreement with US, Pakistan was busy with WoT.
While India was closing 1-2-3 agreement, Pakistan was busy with 26/11 and it's fallout.
While India was busy getting NSG waiver, Pakistan was busy outsmarting US in Afghanistan.
While India was upgrading its relations with US as part of DTTI, Pakistan moved completely into the lap of China through CPEC.
In spite of lack of engagement of US by Pakistan, US did entertain the nuclear deal talks with Nawaz Sharif government in 2015. With Pakistan's dubious record on nuclear proliferation (Libya, North Korea & Iran), US offered the NSG deal to Pakistan provided Pakistan joins NPT, CTBT & FMCT.
Pakistan declined the offer.
At the end of the day it was purely the failure of Pakistan's establishment and foreign policy which could not close the deal with the US.
Rather than Pakistan acting as a cry baby and trying to rock India's NSG apple cart, it should introspect where it went wrong and what needs to be done to rectify and bring their policies back on track.
India's message to China was clear
1) Do not link India's NSG case with that of Pakistan
2) Gave assurance to China that India would not object to Pakistan's NSG application in future as and when it comes up for review once India is part of NSG.
Now the ball is completely in Pakistan's court to ensure that they obtain the support of remaining 47 members.
Rather than expending its political capital on preventing India's membership, Pakistan should have used it for attaining it's own membership. This desperation indicates that Pakistan has lost all the hope for it's case and hell bent on retaining the parity with India by preventing India's membership.
Very unfortunate indeed..