Like you rightly said, GHSP promos are usually an overdramatised version of what they'll eventually show us.
I highly doubt if Maan will even tell her to leave the house...the closest he may come to is considering a divorce...just maybe..but hope not!!
However, even though he cannot love her overnight, why does he think in the extremes...if he has seen the wedding albums, it is pretty clear from the pictures that he was happy about the marriage...none of those pics are going to indicate that he was under any duress to marry her.
So, it stands to reason that he had to be in love with Geet when married her.
So, instead of rejecting her and the whole idea of their marriage, why isn't he thinking of saving it instead?