4. He will never cheat on you
There are plenty of arguments around the world about monogamy and its naturality. Humans are not biologically wired to spend their entire lives with one person. However, regardless of the scientific fact, one thing remains true, monogamy depends on the personal choices made by two people in a relationship.
A man has to go back on his words or break a promise he has made to cheat on you. If he is a good man, he will never do anything such.