It is perfectly healthy to grieve in bed, with a book. When my dad suddenly passed away, I reread all the Moomin books. In Finland we call this “surutyö”, literally “grief work” - you do what you can to cope mentally and emotionally with the loss and everything involved with it. It is a part of the healing process.
Paperbacks aren’t bound (the pages are glued on, not sewn), that’s why they have always been cheaper than hardbacks, and have the earned reputation of falling apart. My oldest paperbacks are from 1960s and the glue is so brittle that there are a lot of loose pages.