[pm]

This is what happens when one person stops communicating to another due to lack of awareness; the other assumes the worst, and stops reciprocating. They are the only one who knows what's going on, yet it almost always comes down to them saying "Why should I be the first to re-establish communication?". You should do it because you're an adult, and the other person isn't a mind-reader; if you don't, you don't deserve any sympathy when the shit hits the fan.

[takemikazuchi]

I think even before you bring responsibility into the picture, there's a lot for each actor in this situation to gain from reestablishing communications(I certainly can't see what they would lose, except for face). This is assuming the other party is mature and rational though.