Why Won't They Learn?

I got news today that a friend has separated from her husband. They've been together for several years but just in the last couple months got married and had a baby. I realize I am on the outside looking in but when will people learn that your relationship problems will still be there even after you get married and have a baby. Actually you will have new problems in addition to the old ones. Now my friend, who is still on maternity leave, is a single mother with a new born infant and a school-aged child from a previous relationship. For all the hassling I get for being single and 30, I'd never want to be in her situation.