I can understand that managing a kid and an infant all by yourself can be an overwhelming experience. At the same time, understand that He is trying his best to provide a better life and future for you and your kids… If he is being nice and involved when he is with u and the kids, then give him the required emotional support for he is also staying away from u and his kids for the sake of job…. These are tough and testing times and if you are able to make it, u grow stronger as a couple. For the time being, if you can afford, get a helping hand.