Your story is tragic. West pakistans actions brought unfair retaliation against biharis. The whole thing was terribly sad. There were terrible excesses on all sides. War is hell. But this was a completely foolish and avoidable one makes it even worse.It's not that easy to forget.
The attorocities cimmitted by Mukti Bahini were horrendous.
Politically the hateful narrative was sown by Sheikh mujeeb. He deleted Islam and based his agenda on Bengali ethnic nationalism alone.
That led to the alienation of all non bengalis living in East Pakistan. From what I heard from my family elders living at the time. All non bengalis were dehumanised. We biharis were branded "Bijju" which is a rat like rodent.
Once our human identity was taken away from us and made rodents, killing us was just as easy as killing a rat.
My grand dad was well off. He bought land in East Pakistan after he migrated from Bihar in 1947.
He did well and by 1960s he had a mansion.
In October 1971 his house was raided by Mukti Bahini. He as an old man , was a non combatant and had nothing to do with politics, was shot dead in front of the family in his living room.
The Bengali neighbours came to the rescue for the rest of the family, as he had always been good with everyone.
One of his son was an electrical engineer and was on duty at Dhaka power management office, called WAPDA.
He was just keeping the city electrical flowing, under those difficult situations.
Mukti Bahini raided that building and picked up all non bengalis, including him.
He was taken to Dhaka stadium and in front of a cheering crowd, tortured to death, and he was not alone.
Dhaka stadium was killing grounds then, and Bengali crowds enjoyed watching beharis and other non bengalis tortured to death.
I know its not your fault or none of current generation fault.
But when you ask Pakistan for an apology, also look at what your own "National heroes " did to people like us.
Respectfully.