Identity/grief/loss/persistence/perspectives on life, death, and the passage of time

Went through a really hard break up 6 months ago. Since then my life has changed drastically, I am a changed man for the better. But I still struggle mentally sometimes (I am seeing a therapist). I would like to spend more of my free time reading and would like to expand on my perspectives or even gain insight on certain aspects. Any and all recommendations are welcome 🙏 thank you in advance