Why does my heart still hold on when my mind has already moved on?

Assalamu alaikum. I've been making dua so many times, begging Allah to take away these feelings because honestly, I don’t want them anymore. What’s strange is that I’m not hoping to get back with this person. I get it now-we’re not right for each other. After everything that happened and all we talked about, I’ve lost any hope that things could ever be like before. I think he has good traits, but I just don’t see him as the right spouse for me. So why is my heart still stuck when my mind already knows it’s over? These feelings tire me out. I just know that if someday I see him marry someone else, a piece of my heart will ache. But at the same time, part of me would feel relieved-no more wondering “what if,” and he deserves a wife whose dreams and path fit better with his. I don’t hate him. I’m just not wired that way-even after being hurt, I still try to see where the other person is coming from. But I feel shy, almost embarrassed, that these feelings are still here after all that’s passed. I really want to let go and get on with my life, but it’s like my heart is dragging behind. Islamically, why do these feelings linger even when we’ve accepted the truth?