Boyfriend cheated me and ran away from Bangalore

My boyfriend have cheated me upon 4yrs of relationship including 8months living in together relationship. A month before I gave a complaint against him. Police said that they will file 493. But my lover threatening me that he will commit suicide if I go to the station again. He is telling me that he will marry me, but I know for sure he will not. I have a call recording which states that we were together for 8months and he agreed that he had a sexual intercourse with me. But now when I went to police to file a case, they were telling me that WhatsApp chats and this call recording is not considered as a proof. So we can not file a case and started advising me. When I said him that I am going to file a case, my lover switched off the phone and ran away from Bangalore. What I should do now. I want to marry him or he have cheated me, so that he should get punished. Can anyone tell me how to proceed further and I am somuchhh depressed. Not able to forget him.