When someone is giving me the silent treatment I go to another source of information... friends who act as spies... they tell me the goods. Nothing like hearing from the grapevine why someone's attitude has changed. Then having the upper hand, I'll talk it out but heads will roll. I'd want to know if there's a rumor about me, someone is gossiping something bad about me, everything. IF they still drop the cold shoulder act I'll dig deeper to pinpoint what's really wrong, psychologically was this person traumatized? I mean what happened? If it is hard to speak, then it is a matter of a personal nature then a professional shrink is in order or just be supportive if therapy doesn't help. If all else fails then pray really hard. If it is not meant to be then so be it.