I know that Meera is not liked by many and they feel that she has to move on and find someone who will love her, only her.
But the emotion of love, even in real life, is not based on logic. You may know that the person is not suitable for you, does not love you, but still the heart continues to hope because even though the other person does not love you, you do!
I think this is the case with Meera. Probably, no, definately, she knows that even in hate, Jai belongs to Bani. But for whatever reason, Jai and Meera are supposedly married. And Bani has not entered in their lifes for 6 years. So, it is not unreasonable for Meera to continue to hope, that Jai would love her, even if he did not in those 6 years. Because you see, LOVE knows no logic, does not think rationally! Meera loves Jai Walia, there is no doubt about that. Jai only loves Bani and Bani, Jai. I am pretty sure, Meera deep down knows this, and yet wants to hold on to Jai only because she loves him. So, though the creatives till now have shown Meera as a doormat, her feelings are not illogical. I think that in real life too, a woman especially, will do all she can to make her marriage work.
But being a supporter of Jai and Bani pair, I hope that Meera does bring them together, since, love also means doing what is best for the person you love!!