According to Hamid Mir, pro-Imran, the exchange conversation between Imran Khan and Gullali did happen and the reference of marriage has been used which does suggest that the exchange conversation did happen.
Then Hamid Mir said quoting Imran Khan who did confirm that he advised in fatherly manner to propose getting married [to whom is unclear].
From all the accounts, that exchanged conversation did happen. By all means, Ayesha Gullali might not be lying about the marriage reference. But the version between both sides differ in some parts which will be found out in the court.