Pavan Kumar 12 March 2019
P. Venu (Advocate) 13 March 2019
From the facts stated, with the passage of time, agrrement is no longer enforceable. You may inform him accordingly and return the advance, if any, received after deducting actual expenses incurred.
Dr J C Vashista (Advocate) 14 March 2019
Issue legal notice regarding termination of "Agreement to sell", however, you can also file a suit for specific perfomance and/or declaration.
Consult a local prudent lawyer for proper guidance and proceeding.