Threatened by Girlfriend

Hello All, I am in relationship with one of my colleague, I knew this colleague as friend from last your years and we met once due to work purpose, she requested for a job in my work stream and she got it and we became close friend of mine and she started so share her sorrows with me about her in laws bad behaviors towards her and she told that she is planning for divorce from last 6 years and I decided to marry her once she get the divorce and I made it clear the divorce should be your decision alone and she agreed to it and since we are working under same office and under same project so we both share the common platform of work - we never had any intercourse till date, except kissing and hugging and we are in the 6th month of relationship now and during the course of 6 months she has abused me verbally and physically by slapping and kicking in all the way, which I can state as a domestic violence towards me - the reason for this abuse is I am not ok for being physical before marriage and she is tracking me by every means due to which my professional carrier is getting impacted and she always demands for more time from me and since no one talks to her either her in laws and her parents so she is putting all her frustrations on me, I think in long run this relationship will suffer due to her mood swings and do due to her urge in making small issue as a pitty big issue, when I say this relationship is not working and its suffocating me due to frequent fight then she is telling that I should have decided before committed to the relationship - she is threatened me that she will destroy my carrier and life. After the abuse on 2nd sep I took 15 days time from her to decide on the relationship to continue or not, I am not interested to continue the relationship with before because of everyday fight over a phone call, I want to end this relationship and I want to move forward, She has given time till 17th September- if i am yes she will be good if no then she is threatened me she will not leave any place to spoil me. I want to end this relationship please. Please help