Why is it so difficult to be whole again, why is it so difficult for me to mend my broken heart? What exactly am I doing wrong in mending it?

No, you are not doing anything wrong. A heartbreak hurts a lot, and the affected person needs time to heal and switch from one phase to another. If are still in the phase of "mourning", it is normal. Live it, feel it, but don't stay there too much time. One day, just choose to detach yourself from it. Surround yourself with friends, people and things that make you happy. Music too. Seems that it's easy to say but difficult to do, but sometimes the solution is in front of our eyes and we don't notice it...

Thank you for sharing the music that keeps you occupied. When that song from Lewis Capaldi came out, I learned to play it on the piano 🎹 :))

Btw, do you play some musical instrument or do you sing?