His first tip, only get married once and stay married, is a pretty good one.
"Choosing the right partner" is good, but people change and grow apart and grow bored and meet other people who they might like better than their spouses. The "right partner" when you're in your twenties may not be the right partner twenty or thirty years later.
There are large numbers of divorced boomer women going into old age alone and poor figuring out they made a huge mistake.
So for a female audience this is probably important advice.
Don't get divorced because divorce is expensive... not such good advice. Choose the right partner and don't settle so that you don't get divorced... good advice.
Making a blanket statement that one should know how someone else feels is ignoring that the other person may be actively trying to suppress/hide it.