And he's probably not going to be. But he keeps projecting that unhappiness on you because he feels like he can. Draw a boundary there. When he does call you, keep the conversation minimal, don't let him try and bring you down. You have your kids, you have your life, and as far as he's concerned, you guys are doing fine. He's responsible for his own happiness, until he realizes that (because you aren't letting him project on you anymore) then it won't get better.
Me: 24 H: 26 2 SS: 7 & 5; D: 3 H filed D papers: 8/2/10 OW discovered: 08/10 D papers counter-filed: 10/2/10 There is no method to my madness