Bigamy may be committed by one person

Dear PAO,

Paolo convinced me to marry him, and our marriage took place in 2016. After two years of marriage, Kristine appeared and claimed she was legally married to Paolo. I was really shocked and could not forgive Paolo for deceiving me. I would like to file a case for bigamy against him, but Kristine mentioned that I am likewise liable for the said crime. She added that the said offense cannot be committed by Paolo alone as bigamy is similar to the crime of concubinage where, as they say, it takes two to tango. Am I really liable for the crime of bigamy?