Yes, I do feel Abir is lonely in his family. On second thoughts, everybody in the family seems to be lonely because the lines of communication are more or less closed.
On the outside, their family seems complete but actually it is highly dysfunctional. Ketki running away from her Gol Dhana, Meenakshi being totally clueless to the desires of her family, her brother and SIL's dissatisfaction, Abir's self-imposed exile and Kunal's workaholic ways all point to that.
Meenakshi has created a well-oiled machinery and not a family. Family members do not feel so stifled and hesitant about expressing their feelings. She does not realise that in her attempt to protect the family against harm, she has created a 'sone ka pinjra'- glitters from the outside but a cage is a cage.
I feel that Meenakshi has poured all her energy into controlling Kunal because she thinks Abir is a lost cause and she can't control him. People see Abir joking and smiling all the time and think he is happy. However, he also nurses the wounds of the past but no one tries to heal him because he never expresses it. It's sad that Meenakshi does not try to see past the smile. She is so offended by his 'disobedience', that she cannot see his pain.
I know Meenakshi's so called intentions are good but when the outcome is so bad, the intent ceases to matter. Also, it's not like she has not had time to correct her behaviour. She has been this way ever since Abir's dad left. The onus of change lies on her.
In Indian society, a lot of the times people do not expect elders to change their ways, even if they harm the family. People believe the children of the family must yield. This is not the correct approach because what is wrong is wrong. By changing or admitting their mistakes, elders show the family the way.