Sexual harassment

I m from middle class family..I met a guy through social media n planned to marry but with a condition to stay permanently settle down in Hyderabad only..after 7 months he was planning to go to UAE I m not interested to go .we cancelled our proposal n we were friends.. suddenly my father expired n I was in unstable conditions n was handling my family one day suddenly he messaged me n said I want sexual relationship with me I refused his words...I said him clearly my father expired but simply he said I m least bother about your condition.. though we were not into any living relationship nor sexual relationship..he warned me if I won't accept his proposal he will make my nude pics n videos n he will upload into website so that everyone will see n also he said one copy will be sended to my office people too..when we were good in Normal relationship I had sended my pics n videos to him..now he is blackmailing me with them to have sex with him..I have WhatsApp messages n all what he had sended to me..my present condition is I can't say anything to my parents and I can't go to any p.s because my father expired my mother is in that depression n she is a diabetic n htn patient.. please help me out...I m not able to think anything..if he does anything wrong I have only one option of commiting suicide..no other option.. please help me out. T