I'm reading a book at the moment with this title. My parents divorced when I was 18. They were unhappily married for sometime, so it wasn't a surprise, although still a shock. I was away at university for most of it.
I wanted to read the book to see if any things in there related to or resonated with what I felt at the time, as I'm not even sure what I felt.
I think there was a definite sadness that my family or ideal of family was 'gone'. I felt like I was broken. That was elevated by the fact that I knew the truth - it wasn't a single event, but a whole mess over several years. 'My parents are divorced' barely felt adequate.
The other thing was just the not knowing, or not being able to see what the new family life might look like.
That's about as far as I've got. I might just post more here and read it over at the end of the book.