Something I am slowly learning for myself is that our feelings come from insdie us and it is not the situation that dictates our emotional response, but our own values, beliefs, experiences etc...I wonder if your friends behaviour triggered anything that may have happened to you previously - a previous incident where you felt abandoned, betrayed, mocked? Also it sounds like your friend respected you enough to share that he was seeking therapy - maybe he couldn't share other details as it was too hard for him? None of my friends know anything about my stuff.