I have not read the book but have no problem with her expressing her love and missing her former husband. I believe they each attended the other's wedding and stayed in close contact for Wolfie's sake. Even I expect Demi Moore would do no less if Bruce passes before her. Demi and the new wife all did the shut down together. Sometimes love is there but marriage is not.
I am sure Eddy would be crushed if had to live a life without Valerie a phone call away.
"Live frugally, but love extravagantly."