I have noticed that nice things happen when you’re not looking for it, is there a book that could help me care less/not overthink/not look for something?

Just got out of a pretty nice relationship that was simply not meant to be, and i realized that the reason i got into it in the first place was because i was already too hurt and broken to be looking for anything, and when i wasnt looking for a relationship, it came out of the blue and it was a nice couple of months

Anyway, whilst i liked how it went, i just dont think i am ready for another relationship, yet i sense myself thinking about relationships with almost every single person i talk to, how do i stop it and go back to how i was months ago?

And thank you