When will I be rid of him???

I found out my ex cheated on me throughout most of our relationship two months ago. We broke up but stayed talking/being intimate until maybe a month ago and I stopped being intimate with him and started to hate being around him. I felt uncomfortable knowing he had cheated on me and manipulated me for so long. I felt inadequate and ugly and disrespected. I was disgusted by him. He wouldn't let me break up with him. Every time I tried he would say he was going to kill himself or hurt himself or beg for me to at least be his friend. It finally got to a point where I told him I wanted to break up and he screamed at the top of his lungs, "THAT'S NOT WHAT I WANT!".

He has been fighting tooth and nail to keep me with him yet he continues to talk to/have pictures on his social media of the girl he cheated on me with. Finally yesterday I hit my wall and I told him I hated him for what he did to our relationship and what he did to me. I told him to never contact me again and I blocked him on everything. I said a few more petty things that I regret like "Move on, I know you can since you seem to be unable to get enough of her. Go on back, maybe you two can screw each other over for the rest of your lives now for all I care."

I haven't heard a peep from him since I did that yesterday afternoon, but I fear he'll come to my house or my work. I even had awful dreams about him kissing her, and other girls, in front of me last night. In my dreams he said "I cheated on you the whole time, I never loved you"

I'm in agony. This breakup has been awful because he was my best friend before all of this went down and it's really hard for me to adjust to life without him in it. It felt so awful to tell him I hated him but I feel like it's the truth, even if it was painful to say.

When does it get easier?