I don't know what to do

In March I started a new job a few weeks later I found my mother dead after leaving the house for half an hour. She had fallen down the stairs. My work were very supportive through everything. My manager especially so. We ended up meeting up and talking he kissed me and made me feel safe. We started going out and he would tell me everyday how much he loved me and he would look after and protect me. After a while he would start to get annoyed when I was down or sad then we would argue and he would tell me he was sorry he just hated feeling useless when I was sad. Whenever I drank the next day he would tell me how nasty I was. He hates me going out with my friends and he was concerned for me. If I was out I would need to leave once he finished work. He started to accuse me of cheating all the time. He would tell me how much he needed me and that he was the one who was always there for me. He would tell me to tell him how I loved him more than anything he would get annoyed when I said I loved my family too. Two nights ago I was out with friends I asked him to pick me up after his work. He was not impressed but wanted to see me. Thinking to make it up to him I bought him a take away. I fell asleep at my friends and don't remember him picking me up. I had drank alot. 1st thing I remember is him coming in the house and telling me how my friends had fallen out with me and I was disgusting and my friends all thought I was on drugs. I messaged my friends apologising they replied saying I had done nothing wrong and just fallen asleep. Also i was not on drugs. I was Confused why would he make this up. He then started accusing me of cheating again. Took my phone off me and went through it. He saw very old messages from my ex I explained to him that he could see how old the messages were and I hadn't thought to delete them. He started calling me a slut and I was disgusting. During about a 5 hour period he grabbed me by the hair and threw me about, he grabbed me by the throat, he put me in a choke hold, bit me and then he would cuddle me saying he was sorry and he loved me and we would just go to sleep and forget about it. When I replied no he would tell me I was just drunk and I loved him. I told him it was over he said things about my mum told me he couldn't leave me because I was mentally unstable. He grabbed a hold of my hair and pinned me down and kissed me I did not kiss him back he grabbed my face, my chest my bum told me that I was a slut and we should just have sex. Then that he cheated on me and was only with me for sex but I was shit at that. He wouldn't leave my house and I couldn't get my phone off of him to phone anyone. He then cuddled me and wouldn't let go no matter how much I struggled and told me to go to sleep. When he woke up he tried to kiss me and said he loved me. I told him we were no longer together. He replied that I told him I loved.him last night and that I still wanted to be with him I was just drunk I told him I remembered everything. He eventually left for an appointment which I got blamed for making him late. Since then he's been bombarding me with messages asking to see me and he's sorry. I have to work with him and today when I seen him at work I nearly took a panic attack I was only in contact with him for 2 minutes. I honestly don't know what to do.