3 years late and I still miss my ex

It’s been almost 3 years since me and my ex broke up, but I still haven’t fully moved on. We never really got closure. He told me it wouldn’t work because he was moving abroad and didn’t want a long distance relationship, but I feel like he just lost feelings.

We were classmates in uni and it was love from the first sight, in the beginning he loved me so deeply but with time things changed. We were on and off a lot, at one point we were apart for a whole year, we were together for about 2 years.

I compare everyone to him. I haven’t met anyone who made me feel the same way, and sometimes I feel like a part of me will always love him because I truly thought he was my soulmate.
l’m working and focusing on myself, I work full time, I’m doing a PhD, going to the gym, living alone, and trying to get closer to God. But emotionally I still feel attached to him.

I just want to know if anyone else has gone through this. Did you eventually move on? And if you did, what helped you finally let go?