Question: signs a guy has his guard up?
Answer: Anger and Bitterness. When the unavailable person isn't directing anger and bitterness towards you, they're projecting them onto someone else. ... 
Arrogance. ... 
Controlling. ... 
Evasiveness. ... 
Invasiveness. ... 
Poor Listeners. ... 
Seeking perfection. ... 
Questionable relationship past.