Meera wont leave Prithvi for 2 reasons ..
One is to keep her father and mother united which is her only mission right now and its possible only if she remains connected to this village and Prithvi .. then Sudha wont b able to leave Meera and the village 🤔...
Two is I feel Meera knows the importance of marriage and mangalsutra because she has seen her mother keeping her mangalsutra intact all these years and never ever thinking of second marriage ...She has also seen that even though her father was froced to get married again but his loyalty always remained with Sudha only ... So Meera knows the institution of marriage is no kids play and thats why she will not simply break it off with Prithvi