It could happen

She could meet the most incredible guy tomorrow. Someone that would truly sweep her off her feet. He would love her well. Treat her respectfully, kindly, lovingly. He would prove every thought that she has about relationships wrong. But somewhere in the back of her mind she would wonder. What day will he wake up and decide he doesn't love her any more? Will it be tomorrow? Will it be next year? Will they be married for 20 years with 2.5 kids and it will happen? Or worse, would it happens early in the marriage, and they don't get divorced but they live a loveless co-existence together for the rest of their lives?