He would actually have a duty to mitigate damages which means that he could not keep collecting full rent from you and dragging his heals finding a new tenant.
I agree that if he rents the unit right away he is going to get a bit of a windfall...750.00 in the 75.00 per month fees and 650.00 for your security deposit. However, that is only two month's rent and a two month's rent lease break fee is not at all unusual in Indiana. However he will at least spend a bit of money finding a new tenant and preparing for one.

