Possibly. I don't have the time to read it all so you are going to have to study the Nebraska seller disclosure statute:
2017 Nebraska Revised Statutes :: Chapter 76 - REAL PROPERTY :: 76-2,120 Written disclosure statement required, when; contents; delivery; liability; noncompliance; effect; State Real Estate Commission; rules and regulations.
Did you get a Seller Disclosure statement?
http://www.nrec.ne.gov/pdf/forms/spcd712.pdf
If he outright lied on the statement and you can prove it, it may be worth suing him.
Consult an attorney.