I know it is painful when someone takes actions that really throw a wrench into the whole situation...

At a minimum assert your feelings...I don't want to put words in your mouth...something like "you know that action (insert action here be specific) put our friendship in a very questionable position"...

Consider waiting for a response...consider not saying another word...consider waiting minutes or ten's of minutes until he says something...

His response will tell you everything you need to know about what value he puts on this relationship...then you will know what to do...