There are only 5 basic needs for any adult (air, water, food, shelter, and clothing)
You don't "need" to talk to him. You "want" to talk to him. However he does not want to talk to YOU. That's his option!
Send him an email or mail him a letter to say whatever it is you want to say and leave it up to him to contact you.
Your real question (to yourself) should be, "Why do I want to talk to a guy who treats me like crap and does not want to talk to me?"
Sometimes you have to accept things as they are and move on. With almost 7 Billion people on the planet I have to believe you could do better! Best of luck!