Somene suing me, contract is evidence?

i sold my house to this first time home buyer nearly 2 years ago. today he emailed me and said that i was held responsible for broken roof tiles that cause water damages throughout the 2 years. He is suing me for "undisclosed" damages. The buyer emailed me that i signed a paperwork from the termite company that stated the release of liability for roof which i can see my signature very clearly. It did not mention any broken roof tiles, BUT ON THE BOTTOM, there was a big fat circle around "broken 122 pieces" in PEN. The termite company didn't notify me about any broken roof tiles. I did not see that big fat circle when i signed the contract. There were only 1 copy of the release. The first time buyer emailed me again and said that on his home inspection report, it did not mention any roof tiles damages and questioned the termite company why the escrow company didn't received that liability form. The termite company didn't send the roof release liability to the escrow company. It funny how the owner estimated the 122 broken tiles last month, and on the release liability roof form it stated 122 broken pieces. How can the termite company have the same estimation which it was nearly 2 years ago. Anything could happened(heavy wind and rainstorm, earthquake, etc) Whose fault is it if we go to court?