I agree with what Rose said about making sure that you, yourself are taken care of in life. Putting away for inheritance is fine and well meaning, at the same time, your kids are grown now and can begin retirement planning for their own lives.

Is the agreement not yet filed?

You can grow to not hate him and still attend to your own future. What about alimony? He has no say over how you spend each dollar. Since he strayed thus ending your binding marital contract, he's free to choose how he spends his own money. As you determine how to spend your own.