Hi, My cat keeps giving me the silent treatment. Should I try meowing back or learn Morse code to communicate with him?

Not knowing much about cats, I'd say have him checked by a vet just in case. Perhaps the cat is upset with you about something. Did you feed him at the usual time? Did you forget to change the litter box? Were you too busy doing something when he needed your attention? Or maybe he just wants to be left alone!