An affair is like when someone has a secret that they keep from their best friend. Imagine you have a special toy that you love to play with, and your best friend doesn’t know about it. You play with it when they’re not around, and you don’t tell them about it. That’s kind of like an affair, but with grown-ups, it usually involves feelings and relationships.
Think of an affair as a secret garden. There’s a beautiful garden hidden behind a wall, and only certain people know about it. The garden is kept secret because it’s not supposed to be there or it’s not supposed to be shared with everyone. When someone goes to the secret garden, they’re doing something that others might not know about or approve of.
An affair can also be like when someone borrows a book from the library and forgets to return it on time. They keep reading the book, enjoying the story, but they’re not following the rules. In grown-up terms, an affair means someone is not following the rules of their relationship, and it can make people feel sad or confused.