Hi Bobo,
I am so sorry ... my sister is in a similar situation and has decided to relocate to Singapore with her son. It is a difficult time for her, having to start a new life, a new job and help her son adjust with the change, as is for you.
You must not go through this alone, if it's too painful to speak to your friends or family right now, please accept the help extended to you from this message board. What's given my sister strength during this bad period, is the understanding and support she's had from the family. Don't do this alone.
For your legal position:
You can go to the Law Society's site for information on divorce in Singapore: http://www.lawsoc.org.sg/awareness/divorce.html
Good luck!