Lou has given you some very wise advice about your emotions being all over the place right now. Enjoy the NG's support for the time being and when you are stronger and divorced, then you can explore what comes next w/him.
I'm very happy to read that the treatments are going well. I am keeping you in my thoughts and prayers, especially with the scan coming up.
As for the children and the ow, they feel what they feel and no amount of money is going to change that. I agree w/Lou, this is something that your h will need to figure out w/the children. It may or may not ever happen, but that's not for you to worry about.
Keep focusing on you and fighting the cancer. Take care of yourself!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.