I hear him talking and he's always somewhat on the outskirts of all that is happening with his kids, his family. He walks away when things get too much.
He also wears these awful black shades during most of the show and squeezes out these meek attempts to stand up to his wife. 
I read a slew of reviews on the show and was shocked to see how many people thought Kate was a bossy wife. I agree with this assessment yet feel it is his fault entirely that he gets bossed around this way. You teach people how to treat you....he just allows himself to be treated this way.
It's sad about the divorce, yet he seems to want to move on now that he has money and believes he might get a better girl. It's like you can smell his excitement at being single again....so, so sad. As he says, "I am only 32.....I have to take care of my needs.......and that of my children". Somehow I don't see Kate hooking up with a new mate as immediately as we all know he will.
As in MOST divorces the woman gets the kids and continues to raise them, while the man gets to go and pretend his a single man once again. He says his kids are his priority, but this entire disruption happened because he wanted to see what else was out there besides Kate. Signs of a typical insecure male who needs the "stuff" to fill in what he's missing......too sad, the family and their love is not enough.
But nothing is truly sad or ever really a loss. I hear strength and resolve in Kate's voice and words and know she will come out a much better person. Anyone who can jog 1 hour a day and be present to raise 8 children daily regardless of her crumbling world is a winner in my book.