First of all, I hope their separation is only because of Geet not being able to find Maan at first and won't continue after she finds him in the hospital. What we know from the promo and the now confirmed by StarOne article, is that Maan remembers only Geet's name and nothing else so why would she not tell him who she is? So I imagine that when he is being tortured by goons he is thinking of her with so much focus and worry and concentration that that is the only thing that remains with him after the attack.
Now coming to after, I think Geet will at first be mad at him for being late, especially because they had the tiff about her working but will slowly get more and more worried. She searches frantically for him, with Adi, if he has found them by now, but to no avail. After a few days she goes back to teaching but you can tell her heart is not in it...one of the parents ask her what is wrong and she says, her husband has not come back blah blah, the lady makes some dumb remark about how all men are like this, which hurts Geet but she doesn't really believe it. Tells herself that Maan could never do that! Then the same parent comes running back later and tells her that there is a man in the nearby nursing home who was admitted the same night Maan disappeared who does not remember anything! Geet rushes there.
In the mean time Maan wakes up from coma saying Geet's name and the doctors are helpless because they don't know who he is and he can't remember. After this he keeps having Geet-dreams and wonders why that name unsettles him so much.
Geet reaches the nursing home and sees Maan sleeping through the glass, expression of immense relief, but worried about why he is in hospital. The doctor comes up behind her and asks, excitedly, do you know this man? She says, yes, this is my husband, MSK. Then doctor tells her about memory loss as seen in promo and she is crushed. (I am only now answering your post, actually, but all this build up was fun!). He tells her to go meet him, but to be careful as he is still sensitive and has a short temper (Geet can't help a small smile here). She goes in and calls his name, he looks up, no recognition and asks who she is. She says, "Geet". All his dreams, visions flash in front of him but he some how can't piece it together. But he trusts her and goes home with her. Doctor tells Geet not to try to tell him anything but to try and trigger his memory. She does everything in her power, and a cute relationship builds with him depending on her completely, but nothing works decides she has to take him back to KM at risk of Pammi's wrath (who may or may not think Maan is dead). At KM Pammi finds out they are there and tries to attack Geet, Maan sees from behind and memory comes back, all Maneet scenes, bankruptcy scenes flash! He gets all angry, of course its raining so he scatters water droplets everywhere as he screams, "GEET" and then saves Geet in a totally heroic way!
Sorry this is so long, I got kind of carried away😆. I have more ideas on what is going in with Pammi-Dev but I restricted it to Maneet for now to at least try and stay a little relevant to your original post!