PS I Love You book by Cecelia Ahern(2004) and the movie (2007)

This is MY book by Cecelia Ahern.  This is her first novel. 

Inside the book you will find this quote

From imdb

The film is dedicated to Sandra Windland "Wendy" Smith-Rice, sister of the movie's producer, Molly Smith.  Windland Smith Rice died of Long QT Syndrome Type 2. The Mayo Clinic has opened the Windland Smith Rice Sudden Death Genomics Laboratory to study this and similar diseases. Info from Wikipedia.

To those who know me well, my Hollywood Crush is Gerard Butler.  He's on top of my list among the big ones in Hollywood.  
Of course, I wouldn't miss this for the world and I'm so glad that he and Hilary Swank jell.  
If I were Holly and he was my Gerry, then I would have a hard time moving on too.  Gerard played the part so well and I'm not just being biased.  The moment he entered the travel agency I was tearing up already, but chuckled a little because...  ;-)  I couldn't have picked a better Gerry.  Gerry is Gerard and Gerard is Gerry, which incidentally is what people close to him call him.
Did I imagine Holly to be Hilary?  Honestly, no.  Not in my wildest dreams did I think Hilary would play Holly, but you know what?  She became Holly.  The American Holly in a parallel universe. 
Sometimes, as long as we don't dwell in it, we should look at the past, reminisce a little, but keep moving forward.  We should open our doors to others and let them in our hearts.  We must be wary, but not suspicious of everyone.  Not all cars that stop and do not open their windows are stalkers even if you were already letting them move forward(not a part of a movie, but...).  #keepmovingforward
Holly is very blessed because she is loved by friends and family.  Grief is a very serious thing and not a laughing matter.    
From Psych Central:

You should try and not judge how a person experiences their grief, as each person will experience it differently. 1. Denial & Isolation. The first reaction to learning about the terminal illness, loss, or death of a cherished loved one is to deny the reality of the situation. ... 2. Anger. ... 3. Bargaining. ... 4. Depression. ... 5. Acceptance.

Holly underwent those things.  Thankfully number 5 happened and it's the how you need to find out.
I suggest that you read the book and watch the movie to appreciate it more.
Nellie McKay who plays Holly's sister, Ciara, is the one who sang this
One of the best onscreen kisses ever  The book and the movie have some differences, but most of the story is there.  For cinematic purposes some situations and names were changed, but did not affect or destroy the beauty of the Ms. Ahern's original story.  From Wikipedia: In A Conversation with Cecilia Ahern, a bonus feature on the DVD release of the film, the author of the original novel discusses the Americanization of her story — which was set in Ireland — for the screen and her satisfaction with the plot changes which screenwriter/director Richard LaGravenese had to make in order to fit the book into the screen.

The film was shot on locations in New York City and County Wicklow, Ireland.

Directed by Richard LaGravenese

Screenplay by
Richard LaGravenese and Steven Rogers

CAST:

Hilary Swank as Holly Reilly-Kennedy
Gerard Butler as Gerry Kennedy
Lisa Kudrow as Denise Hennessey
Gina Gershon as Sharon McCarthy
James Marsters as John McCarthy
Harry Connick, Jr. as Daniel Connelly
Jeffrey Dean Morgan as William Gallagher
Nellie McKay as Ciara Reilly, Holly's sister
Kathy Bates as Patricia Reilly, Holly and Ciara's mother
Anne Kent as Rose Kennedy, Gerry's mother
Brian McGrath as Martin Kennedy, Gerry's father
Dean Winters as Tom


They and the others not listed here were chosen by Heather Comer, Jocelyn E. Thomas and their team.