2. You can't be yourself around him. Are you playing a character of who you think he wants to be with? Not only does this perpetuate a relationship based on lies (even if it's just through omission), but it also can be detrimental to your emotional well-being.

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Lying about your job or considering a breast enhancement just to impress someone or to fit into their "ideal" is a bad idea. The best partners are the ones who make you feel great in your own skin and who you can relax around. If you reveal your true self to someone you're dating, and he doesn't appreciate your true colors, dump him.

3. He's a user. We all know the type - the freeloading dude who spends his days in the coffee shop, nights playing in a band and lives with his parents. However, users aren't always this easy to spot. It may start slowly as he "forgets" his wallet or has his car "repaired," but if you notice that these situations are becoming more normal than exceptions, it's time to run.