"He says he withdraws because certain mannerisms, facial expressions or behaviors of mine trigger him to run away, however he has difficulty articulating what they are, and is not able to talk to me when it happens. He describes the same things i feel around him, however I have explained to him in detail the behaviors that trigger me."

I can totally relate to this particular thing. My boyfriend doesn't withdraw, however. He gets angry. VERY angry. He says that my energy is off or something. I'll just be sitting on the bed playing a game on my phone while he's listening to music or playing his bass or playing on his tablet and then all of a sudden, he'll say "What do you WANT??!" My response is usually something along the lines of "nothing, sweetheart. I'm fine." That just ticks him off. He says it's BS. I've REALLY thought about it, long & hard, and 99% of the time, when he asks me that and/or thinks I "want" something, I TRULY don't. I don't know how to explain to him that I'm perfectly content just sitting there playing Fruit Frenzy or something. He says it makes him very anxious because he feels like I'm just sitting there quietly waiting for him to pay attention to me. I don't know if that's actually what I'm doing and it's just VERY deep in my subconscious but I've REALLY REALLY racked my brain and I can't seem to rationalize that thought. I wish you the best of luck with your situation. Please send me some good vibes, too. I'm just hoping to make it through one day where I don't anger him so much.