The law of preemption is there which makes the seller to offer land to the adjacent land owner first if he wants to sell the and. This is alw is however hardly followed.
Mere cancellation of sale agreement and return of advance money does not make the dela as cheating. However before doing this first ensure whether the adjacent land owner is ready to oay the market rice or not and for doing this send him a a notice quoting a price for your land and fixing a deadline to seal the deal. If he fails to do this then you can sell the land to anyone you choose.