Can a Landlord rent out his house while it's in a contingent sale transaction?

[Hamada Beeka]

Question from the other side, appreciate your help:

House owner was trying to sell his house but didn't get good offers so he rented it out to me, we signed a lease and I gave him the security deposit.

Later before move-in, the owner said the house was in a contingent sale which the owner cancelled but the buyer didn't and the buyer fulfilled his conditions and he wants to move forward with the sale

What are my options as a tenant, move in date not reached yet and owner saying sorry go find another place to rent?