How do you move on?

He moved on with the girl he left me for the second we broke up. He emotionally manipulated me into thinking I was crazy and that something wrong with me when I called out him flirting with this girl. I would always broach the relationship concern with care and gentleness, but he would react with so much anger, dismiss me altogether, blame me, or threaten to end the relationship. I always forgave him.

It got to the point where we were both attending a wedding, and he got super drunk. He would spend time with me at our table, but would always try to leave so that he could bring drinks to her and talk to this girl. He gave her a lot of alcohol to the point where she blacked out. I called him out, saying if he was flirting with her. Then he left with the girl, and yelled at me in front of his friends at a wedding telling me to go home, that I'm not invited to the afterparty, and that I'm jealous. He went in the car with two of his friends and the girl. As he was walking with the girl, he yelled at me while I was driving away in my car saying, GOODBYE. And he waved. I forgave him when he apologized the day after. It was the first time he apologized and that's why I took it. However, he only apologized because he got caught by his friends publicly abusing me, and his friends called him out for his behavior.

Ever since, I noticed that he started withholding affection, and would quickly leave right after our dates. He wouldn't text me as much, cancel dates the minute of becauce it didn't fit his schedule, and would be MIA when I was really sick. One day, I decided to tell him that I felt like the night of the wedding really affected me to the point that when he is MIA I feel like he may be talking to other girls. Instead of comforting me and telling me that these things are not true, he told me threatened to break up with me, but then took it back. Then he said that the night of the wedding, he broke up with me (and I had no idea because he always acts like this). He said that whatever he did that night, he could have done it because he broke up with me.. yet, he came back the next day to apologize to me and get back together? I just could not understand and broke up with him. He forced me to break up with him by avoiding me at all costs when he said he needed time/space.

TLDR

We see each other at church and he works in ministry. I am traumatized. The day before I go to church, I cannot sleep. The day of church, I cannot sleep. Everytime I see him I fear that if I see him approach this girl to flirt with her, I will be crushed. He knows that, so he has been hiding the relationship that he has with her. How do you move on?