Three tools. Real-or-fake friend decoder. Friend-map builder (saves to your device, private). "What to say when..." picker.
Pick one specific friendship. Answer honest. The decoder gives you a read.
Build a map of your circles. Inner circle = the 1-3 you tell real stuff to. Outer = the 5-15 you play with. Saves only on this device.
Pick the friend situation. Get 3 things you can actually say.