But if it feels like you're constantly doing things on your dime, this could be a major red flag. It could be a sign he doesn't think you're worth the price of admission. While he can treat you like a queen without spending a fortune, taking you to a nice dinner or buying you the occasional gift is one way a guy shows that he is into you. 

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Many men will throw their hands up and complain that expecting a guy to pay a gal's way is a "dark age" mentality. But chivalry is still chivalry, even if it's near death. And there are plenty of people who still believe it's the guy who should pick up the tab, especially in the early stages of the relationship. If you find yourself constantly reaching into your wallet or paying his way most of the time, strap yourself in for an expensive ride. It's likely he won't change his cheap ways once the precedent has been set. 

3. The Narcissist – Enough about me, let's talk about me! Does this sentiment sound far too familiar? Chances are, you will know plenty about the narcissist because he will spend all of his free time – and yours – talking about himself.