I can certainly offer tips for dealing with passive-aggressive relatives, co-workers, or neighbors as most of us need to do this at one time or another. They would essentially amount to limiting one's time with them and not expecting them to change. However, since this article is specifically about dating a passive aggressive man, I couldn't in good conscience recommend ways to try and make it work. That's because passive aggressiveness is a personality trait that's hugely resistant to change. Being married to a man who behaves in this silently hostile way would be a major source of heartache and frustration for any wife.
Dating is a time to discern whether it's a match that portends a happy and healthy future together. It's not a time to look at a man as a project like so many gals foolishly do. A woman should never be in a relationship with the idea that she'll change her partner. She must accept him “as is.”
If, however, you're hell-bent on staying in a relationship with a passive aggressive guy, you can see if he's open to change. Explain to him that you read an article about passive aggressive behaviors and realized how you sometimes behave that way. Say that you're highly motivated to change this about yourself and request his help. Ask him to point out your passive aggressiveness when it happens.
This is a tactic that will get him thinking about the topic but won't make him defensive. After all, he may have deeps wounds from his childhood that prevent him from dealing with people directly and assertively. He may be frightened to do so.
Therefore, go about this in a gentle way and appreciate any small changes. If he communicates in a straightforward way, be sure to point it out and compliment his behavior. Be a positive role model by handling conflict in a mature and straightforward way without drama. Even if the relationship ends, you will have helped him understand what passive aggressiveness is and how it prevents us from communicating effectively.