A Shameless Endorsement

Men Are from Mars, Women Are from Venus (1992), along with the other books later written by John Gray, Ph.D., are the gold standard for relationship books.

Forget about He's Just Not That Into You; throw that bullshit Steve Harvey book in the trash (or delete the bootleg copy you got via e-mail from your aunt).

It was where I first learned about the "cave" (for men) and the "wave" (for women), just a few of the revelations that Gray proffers in his first book.  I won't go into specifics because I really want you to read this book-- and buy it, perhaps.