Statue of Limitation in CA

[Karen S.]

I have a tenant that filed a lawsuit against me. This all started because he owed me 8 months in rent due to not having a job. I let it go for 4 months before I gave him a Notice to Pay or Quit. Didn't pay so the Unlawful Detainer was filed and then he went to the courts 4 days later and filed an unlimited civil suit against me for habitability, etc. In all the months with no rent, he never once said anything about withholding rent for habitability but always because he didn't have the money. Everything he is sueing me for are issues that are from the past and have already been corrected between 2010 and 2011. Is there some sort of statue of limitation that makes it so he can't go back and sue me? I know he's just doing it because he's mad that I filed the Unlawer Detainer against him.