How would I know that the txn has been dropped by the n/w?
Anyways, its more than 24 hours now since he sent me BTC and I have not rebroadcasted it even once.
Just leave it there already. No need to rebroadcast again.

Your final balance will automatically show zero after it gets rejected by the network (
https://blockchain.info/address/1Atv5LPgx5auEWnovRua7BwbqoZ6ZFdutE)
I am sorry sir , i wanted to trade with you but this sardasa told that i can trade with him and told to send first , i am new to bitcoin so i sent first with minimum fee , and now transaction is unconfirmed , i am waiting for transaction to confirm , and hope Sardasa will not scam me.
Funny thing is, he sent btc earlier and after doing 141 successful transactions he becomes totally unaware of transaction fees.
Poor scam attempt.
