Overview
If you're angry or frustrated with someone right now, giving them the silent treatment isn't going to do any good. If you want justice, you have to speak up and let them know how you expect things to change. Don't wait for them to approach you -- they're content with the way things are right now, so there's no reason for them to rock the boat. It's up to you to establish communications and reopen the discussion. Shape the argument, and don't give up until you hear the answers you need.
