Being blackmailed by a lady

Sir, please help me. Before 3 months I went to a massage parlour there the lady who was massaging me gave me her contact number. After some days I contacted her and went her room and everything happened. She stays alone. She is a divorcee with two kids. Her kids stay with her parents. After having intercourse I ignored her but she used to call me and cry tell about her problems and I got daya(mercy) on her and I took her to movies, restaurants etc. She told that she will never contact me. I showed her my office also once. Now she is threatening me that she is in love with me and not leave me. From last one week I totally ignored her I have not lifted her call then she came directly to my office and she is torturing me that she is pregnant. I told her to leave otherwise I will lodge a police complaint for that also she is ready. She is telling me that she will not leave me till my death. I m in a big problem. Please help me Sir. I even told her that I will marry her but she is telling she will not marry me. Please help sir I'm feeling to do suicide.