Another plus one about grief. I went through a breakup that wasn't like the others, and it was a while before I understood I was experiencing grief (and that I actually didn't know how to navigate that).

I found a book called "Welcome To The Grief Club" by Janine Kwoh that was the right balance of humour for me. It's intended for those dealing with bereavement, and doesn't offer solutions, but I still found it useful for identifying patterns I was experiencing and understanding they were a "normal" part of grief. The brain does some weird things in grief. Only linking here in case it also helps others.

https://www.amazon.com.au/Welcome-Grief-Club-Because-Through...