Don’t know how to get over my ex I still love

I broke up with my ex 2 months ago because I was in a really depressed state of mind when my family friend I’ve know for my whole life, who was like a brother died in a bad car accident 2 months ago aswell. It was a really shitty way to end the relationship because I didn’t want to I just thought it was best at the time because I was fucked up and still am. I’ve been thinking about him everyday, most nights crying and can’t get him out my head. A couple days ago I was really bad mentally and decided to message him asking if he’d want to start things over again and apologise for everything that happened. He replied and said he was seeing another guy and it was a serious relationship and their gonna move in together soon and they’ve only been in the relationship for a week, It shattered my heart when he told me that because I loved him a lot and wanted him to be the one, he said the same things to me aswell we had plans and everything. I know it was desperate of me but I begged him back and we talked for 2 hrs, he blocked me and I stopped I knew he wasn’t gonna come back to me. His bf messaged me and threatened me and I just apologised because I didn’t want o deal with that anymore, after messaging my ex and having that convo I felt disgusted, sad, angry that he could just move on so quickly when we had nearly a yr of dating. I know I broke up with him but I just didn’t think he’d move on this fast I haven’t thought about getting with anyone and makes me disgusted just thinking about getting in another relationship. I’ve just been really fucked up over this and wanting to move on but can’t stop thinking about it anyone have any advice? I appreciate it if u do.