One other thought:
You should get a free consult with a lawyer...

You get half of all assets- half of all retirment, you will be entitled to his social security, maybe alimony and you might find yourself in a good position finacially where you can still help watch your grandaugter....

It is always a good idea to become educated on a decision that needs to be made (you arent filing, no paperwork just info gathering)
I think you would feel really good after you find out what you could walk away with.

And I would also put a keylogger on his computer.

BW-3 Kids

"I was not delivered unto this world in defeat, nor does failure course in my veins. I am not a sheep waiting to be prodded by my shepherd. I am a lion and I refuse to talk, to walk, to sleep with the sheep. I will hear not those who weep and complain, for their disease is contagious. Let them join the sheep. The slaughterhouse of failure is not my destiny.
I will persist until I succeed." Og Mandino