The Bill Nye The Science Guy host was granted a restraining order against Blair Tindall in 2006 after alleging she stole his laptop from him and sent out nasty emails in his name.
They were back in court in 2009 when Nye claimed she violated the order, and she was told to help him pay the $57,000 (£35,625) legal bill he had racked up.
Nye has now filed new documents alleging Tindall has yet to pay back any of the money and he wants a court to enforce the previous ruling, according to TMZ.com.
Tindall tells the website, "Bill Nye was the love of my life. I'm surprised he has taken this action against me. I have no funds to pay him, and he is a very wealthy man, so I'm not sure where this is coming from."