Here's a simple, but crucial, sign. It's a deal breaker when it comes to whether or not you'll be in a happy relationship. And it comes from the French existentialist philosopher Jean-Paul Sartre. He claims that love is an act, not a word, which is another way of saying that love is a verb, not a noun. That promises are meaningless and yes, you should say nice things to your spouse, but it's your actions that will make a difference.

Actions speak louder than words. This is true for love, as it is true for everything else in life. And the degree of happiness and success you will have in a relationship is directly proportional to the depth of your commitment. Because what is commitment? Commitment simply means you are willing to work with them to build something of lasting value.

So, ladies and gents don't just commit; act on it, back up your promises.