What does it mean when they don't make eye contact

I have this kinda close of a friend of mine that won't make eye contact and won't face towards me at all. He and I talk alot but he has this small voice that i can't hear really well. I kept trying to make him have eye contact with me so i can try to read his lips or analyze his emotion by looking at his eyes or something just so i can understand and respond to his chatter. FYI, we always talk side to side while walking, sitting or standing. He won't face towards me and he always adjust whenever i get the chance to talk to him face to face. It's been making me frustrated and i don't know if he's intentionally doing this or what....