My question involves landlord-tenant law in the State of: IN

A friend and I signed a lease for an apartment this past Sept. The move in date is Nov. 1st. The landlord called us on Oct. 20 asking if we could move in later ( middle to end of Nov.). I decided we need to sit down and talk about why he wanted to move the date. After our discussion I stated that I was uncomfortable with arrangements and wanted to get out of the lease. He put the posting back up on craigslist and found a new renter who is going to pay less then we would and have a shorter lease. He stated that he wanted to keep our deposit and some in advance rent my friend had paid him to make up for the difference of the two leases.

If my friend and I don't move in on Nov. 1st is the lease null and void? My friend also paid some rent in advance so, if we don't move in does she have the right to that money?

I also can find nothing in the lease that states this certain scenario.