Employee threaten and drag between two business partner conflict

Sir/mam, i used to work for a private Public Relation (PR) firm and an NGO run by two partner who were also in a love relationship recently they started having difference because of financial matter and during that time both of them were out of station and both of them kept ordering me to block the other person number and not to have any communication but that was something which i didn't comply with. During that period i went to the office for work related and also to used the office computer for my personal work. During that time my male boss ask me go to the office and collect a file which is the employees file and keep it with me when i ask him what will i do with it he ask me to just keep it with me and he will collect it from when he get back to station. so i just kept it with me but when the lady return to station she found the file missing so she call me up saying that the file is stolen from the office and need to file and FIR so i got scared and didn't told her anything about the file and call up sir and told him that sir you ask me keep the file with me and now madam is threatening me that she will file and FIR and put me to jail. boss told me that he will take care of everything. but later i hand over the file to madam and during the course of time i also came to know that madam is the sole owner of both the NGO and the PR firm which contradict what they told me initially when i join them as an employee that they are equal partner. so now madam is threatening me file an FIR against boss stating that he manipulated me or else she will file an FIR against me stating that i had stolen the file and trespasses the office without her permission. during my 4 months as an employee almost 90% of the work direction were given by boss. Boss is still out of station. now i am under depression for the past 1 week cant eat or sleep don't know what to do please help me.