Could it be that they are dealing with your husband's abandoment by being in the house as little as possible, like keeping and staying away from the pain that knowing your husband and their father has choosen this for everyone?
Stay strong and try not to take as if it's your fault, the only thing you have control of is YOU. If your ws wants to act the fool let him, he will trip and fall into his mistake, and while he twisting in the wind, your kids will know who was there for them in the long one, and who was there with the wallet open and buying their love.
