Check out her advice below:
Letter to a friend:
You are divorced. Your ex-husband is not being kind or considerate, but you can't harp on it because it steals the energy that should be given to your potential and power. At the end of the day, your survival is at risk, and you complaining about what he is not doing and what he should be doing does not change your circumstances. We have to use these circumstances to analyze what we need to do different, how do we need to strengthen, and how we need to be more. You are strong and capable, and now you have been put in a position where you must use your capabilities to change your circumstances without your ex's help or kindness.
In the ideal world, the circumstances in which you and your children are facing are unacceptable, but the most painful realization I have had about this life is that we are not entitled to anyone's kindness or consideration. THAT, is a painful truth.
Stay focused and keep it moving.
It's not the first time Smith has used Facebook to address relationship issues. Her Facebook status on how to handle heartbreak received nearly 20,000 likes, and a controversial post addressing her and husband Will Smith's reported open marriage generated nearly 300,000 likes and over 30,000 comments.
The couple married in 1997 and have two children together. Will Smith also has one son from a previous marriage.
Click through the slideshow below for the lessons celebrities learned from their splits.
In October 2011, Kim Kardashian filed for divorce from her second husband Kris Humpheries, whom she was married to for just 72 days. In the August 2012 issue of InStyle UK, Kardashian talked about how she's changed since the split. "I've always been the type to fall in love fast and, with every boyfriend, I plan out my wedding in my head," she told the magazine. "It's taught me to take things slow . . . Anyone would want to move on and take the lesson learnt from it. I loved this person, it just wasn't the right situation for me. I try to hold my head up high and live my life."
In August 2010, Tiger Woods finalized his divorce from Elin Nordegren -- his wife of almost six years. The pair split in the wake of the golfer's very public cheating scandal. At a 2010 press conference just days after his divorce was finalized, Woods refuted the assumption that this had been a wasted year for him. "A lost year? I don't look at it like that," he said. "Every year you have to find the positives. Even though there are a lot of negatives, I think that's actually a good thing. I learned a lot about myself and how I could become a better person."
After eight years of marriage, "Tron: Legacy" actress Olivia Wilde filed for divorce from her husband Tao Ruspoli -- a filmmaker and Italian prince -- in March 2011. In an interview for the August 2011 issue of Marie Claire, the actress opened up about what she took away from the difficult experience. "I kept saying, 'I failed!'" she said. "Admitting that I'm not perfect was a wonderful thing that came out of this. There's this fear that everyone is going to be disappointed in you, but I'm human. I don't live up to any sort of ideal."
Jennifer Lopez split with husband Marc Anthony in July 2011 after seven years of marriage. Anthony filed for divorce from the former "American Idol" judge in April 2012. In the December 2011 issue of Glamour, Lopez shared what she took away from her third divorce. "I think I've finally learned the biggest lesson of all," she said in the interview. "You've got to love yourself first. You've got to be OK on your own before you can be OK with somebody else. You've got to value yourself and know that you're worth everything. And until you value yourself enough and love yourself enough to know that, you can't really have a healthy relationship."
Comedian Louis C.K. split with his wife -- painter Alix Bailey -- in 2008 after four years of marriage. In a July 2010 NPR interview, C.K. discussed the changes he went through and the lessons he learned post-split. "When I got divorced, I thought 'Well, there goes my act,'" he said. "I've been talking about being married for so long -- and I also thought being a dad was part of being married. And then I got divorced and everything changed, and I became a father in a whole new way and found a whole new set of difficulties."
Jennifer Aniston finalized her divorce from Brad Pitt in October 2005. In a 2005 interview with GQ magazine, Aniston said of her split: "I'm not defined by this relationship. I wasn't when I was in it, and I don't want to be in the aftermath of it. And that's really important to me. Let's let everybody move on and live their lives, and hopefully everybody will be really happy."
Reese Witherspoon filed for divorce from husband of seven years, Ryan Phillippe, in November 2006. In a January 2011 Glamour magazine interview, Witherspoon opened up about the importance of learning from her relationship mistakes. "I always say that it's very important not to blame one person," she said. "You have to own whatever part of it you're responsible for. It takes a lot of soul-searching. It's important to go through that, because hopefully you won't repeat yourself."