Care and Feeding Things are never going to be the same. Photo illustration by Slate. Photo by Getty Images Plus. Care and Feeding is Slate’s parenting advice column.  Have a question for Care and Feeding?  Submit it here . Dear Care and Feeding, Just under four months ago, I learned my now-ex-husband was having an affair with a woman at his office, and I divorced him. The problem is that we have two kids, aged 1 and 5, and my older one doesn’t understand why Daddy lives elsewhere now. He keeps asking when things will “go back to normal.” I obviously can’t tell a kid his age the reason we split up. Can you offer some age-appropriate advice on how to explain the situation to him? —Stability Stolen Dear Stolen,  You can explain to your son how marriage works: People choose to partner because they are happy together, but if they find that they aren’t happy together anymore, they can decide to break up.…