My girlfriend threaten to put case against me by showing screenshots

Hello ,n i got marriage proposal thru someone. she took my number from Instagram and says my family liked you, i likes you lot. first i asked her time, later she continuously called me and say yes to proposal. later i accepted too and we had good talk , i said our marriage should happen in respect of all parents. we went deep talk for 20 days, we shared our emotions like initimate scenes from net. later we go for video calling and she started to expose her body and compelled me too . later i feel guilty and i stopped video calling and she tortures me to come to video calling and then i started maintaining distancing by telling her before marriage.we should not spend more time in talks and calls.its not good. anyway we are going to marry. later she threatens me if you make distance , i will assume you are cheating me and will show all mine initimate msg to all.she threatening me and also says i will die ni dont have any evidence to prove. but she threatening, i want to come out