I have written your very post (many times). I don't have concrete advice other than time is what it takes. I did start personal therapy and dove into the gym which seems to help. We broke up over a year ago and he lives down the street with his exgf that he married and she got pregnant a month after cheating on me. I know we weren't meant to be and i'm not going to tell you it doesn't hurt. I still think about him daily at some point and even saw him for the first time at the store. Each day your ex will take up less and less of your mental space but i can relate and time is the key. I also listed pros and cons and just looking at the list helped see the problems that would have ALWAYS been there.
I know it's a tough time of year for many of us. Just keep taking one day at a time and you WILL get there. I'm still getting there
