According to TMZ Robin Thicke Tried to Change Paulas mind about their seperation check it out :

“Sources connected with the couple  tell us … Paula Patton told Robin Friday she  wanted to end the marriage.  Robin then abruptly cancelled his  show, saying he had throat problems.  But the cancellation was solely so he  could sit with his wife and try to change her mind.

We’re told Paula —  who is shooting a movie in Vancouver — and Robin had a long, face-to-face talk  … both acknowledging they had not been getting along and frequently  arguing.

Our sources say in the end Robin realized Paula was determined  to end the marriage and reluctantly agreed, but was very upset. We’re told she  was also upset.

The next day Robin cancelled his Orlando concert  so he could be with their child.”

I hope they can work it out its always sad when children are invoved.