His actions make sense (in a venal sort of way) if you look at it from this angle: he doesn't want to be left out in the cold when the Congress government is making good progress mending fences with Pakistan. He can then claim when it matters (i.e. election time) that he too played a part in the whole thing.
By the way, if Jinnah's vision for Pakistan was that of
"...a secular state in which while every citizen would be free to pursue his own religion, the state should make no distinction between one citizen and another on grounds of faith"what was the need for partitioning India into Hindu and Muslim nations?
