I understand what Pippa is saying. It is not so much that the scenes Michi are together are not working their magic. It is the whole concept of Michi in love.
For a man who is so deeply in love, we got to see his raw hurt only after he found out Prachi was innocent and he very nearly lost her in the divorce which he himself had insisted on. Why did he not show as much concern or pain when he realised Prachi was not home?
Although he was hurt and felt bad for Prachi when his lawyer was attacking her and when she herself told him how much that wounded her, he did not follow up on that emotion. I thought that the pain he felt standing on the stairs of the court looking at Prachi would either make him run after her and stop her or atleast turn to his lawyer and blast him. He did neither. It is indeed sad that he still did not believe her even after her heartfelt lines.
And to make things worse, soon after that he comes home and hears that she has not returned home. Even if she was his worst enemy (which she was not, since he was supposed to still love her) his failure to go looking for her was out of character.
Even the scene where he accidently drops the watch and remembers how she gifts the watch to him, his expression was more vacant than painful. He appeared to feel nothing for this girl whom he is supposed to love. At best all his feelings were of skepticism.
Now for argument's sake if he had not found out the truth,the divorce goes through and he learns that Prachi had still not returned home what would be his reaction? Would he continue to show indifference because of her 'supposed betrayal'?
In fact as Pippa pointed out, even his behaviour after finding out the truth was strange especially outside the court. The first person he talks to is Ayesha. He then overhears a conversation of Dadi over the phone whereby he finds out Prachi is missing. There was pain but not panic on his face. He did not even volunteer to search for her until PL cried out (to no one in particular) that somebody needs to find her. His dialogues with PL was spoken in a tone which was more matter of fact than emotional (all this for a man who is highly emotional). He then goes looking for her in all the places other than the one he is sure to find her in. Granted he must be highly strung considering the enormity of his mistake. But still it is unbelievable that he would miss such an important point unless the creatives just wanted to stretch the story and in the process destroyed a little bit of his character.
So at the end of the day one wonders just how deep was his love for Prachi. It seems to be conditional on the fact that she is 'pure'.
Coming to Prachi's mothering Ritwik, I have mentioned this in other posts. If this was indeed the only problem there was between them and he believed Prachi when she said she was the mother of Ritwik, then why is it that he immediately concluded that she is still carrying on with Neev.
Again for argument's sake, can she not have had Ritwik out of wedlock but never loved any one except Milsi after her marriage? After all she did tell him that he was her life. If he can believe the lie that she was Ritwik's mom, why then was he skeptical about her profession of love for him? So could both the statements not be true, in which case could he have not accepted her and 'her' baby?
The reason he believed that she continued to have a relationship with Neev after marriage was because of all the other incidents of seeing them together (even if it was just conversations at the hallway). Now so far these 'doubts' have not yet been sorted out. All that was sorted out was that Prachi was not the mom. Does that automatically imply that she never had an extra-marital relationship with Neev? Now how did he suddenly get enlightened on this front? Or has he just put that in the background for the present and these doubts will again raise their ugly heads the minute the next hurdle comes in their way?
So at the end of the day, what I am trying to say and what I think Pippa also wants to highlight is that Milsi has not been shown to have that implicit trust in his spouse which is required to make any marriage work. Things have apparently been resolved but the nagging questions remain which can cause future problems.