Colossians 2:8 (NKJV) says "Beware lest anyone cheat you through philosophy and empty deceit,
according to the tradition of men, according to the basic principles of the world, and not according to Christ."
If we look to all the self-help books, relationship books, and tips and tricks from the secular world, we will only receive the thoughts and principles of this world ... which depend on human tradition rather than Christ.
Does it make sense to listen to the world's advice and yet expect the peace of God in our relationships?
If you want better relationships, you'll need to learn from the One who designed them!