@msconfused,
It is time to make things interesting, like what he like or something that would make him drive him crazy. I mean you have to do things to keep the marriage interesting. You gotta work him over. get him into eating healthy. Do things to make things "different". Chances are he is so comfortable or maybe he had too much abuse or just has calm down. Maybe you and him could role play.
I mean sounds like between you are him is not doing their best at all. You need to rediscover each other.
I would start making dietary meals for both of you, or even limit what you and him purchase. Move away from television, video-games, internet, and get back to basics.
Refine each other, ask yourself "Why did you get with him the first time around" and then ask "why you have kids with him now".
..........
Beyond that wait until your children grow up at least, and leave the nest. You will need him for that. So until then just hang on to him. My uncle and his wife did that. They waited until their last kid grow up and was on her own and then she left him.
However even now, they are together ( as friends ) and beyond that are open in their living standards as they have other people as well. That being said he really missed her but it works out for the best between them.
All the while with saving money, and avoiding eating crap, you and him could get into shape, until then.