Say "When"
Hopefully, we figure out "when" before its too late. Knowing when to say it is usually harder than actually having to. We know at some point, its necessary but cant. We may be comfortable. We may be weak. We may be insecure. Whatever the case, it has to be on your own terms. You know the pot is about to boil over, you just don't know when or how bad. Be prepared. Turning it off in time may save you from a lot of pain and extra clean up. Save yourself the mess.