My boyfriend and I purchased some land together. He died before the land was paid for and had no will. I have paid off the land. How can I handle the deed?

That is going to depend on how the two of you took title to the land.   If the deed just says his name and your name and nothing else, you owned the land as tenants in common.   Upon his death, his half interest in the property passes to his next of kin.  If the deeds reads his name, your name, joint tenants with rights of survivorship, or JTWROS, then upon his death the entire propertyis yours.  You will have to record a certified copy of his death certificate and a non-tax affidavit to get clear title.

As 1/2 title owner , his estate must go to probate.