I'm generally used to communicate and debate peacefully and never let contrasting opinions affect the human, personal relationship between me and another person.
Whenever an issue should arise between me and someone else, I openly march to the battlefield with a white flag and try to listen and solve the problem.
I'm slightly puzzled, however, when the other person - especially when it's a good friend - casually decides to sever all relevant communication with me without even exposing the problem, but implicitly hinting at a possible problem I might have created and should feel guilty about.
Typical behaviour: saying "hi" with an forced smile, and immediately speaking with other friends before even giving me the time to ask "how are you?" (and maintaining an avoidant attitude).
How do you suggest I could understand the issue or at least make the friend quit the acting and speak openly of any doubts or problems he has convinced himself of?