Guy I'm dating goes quiet/silent treatment on me?

I have noticed if I don't have the same opinion/want to do the same as he does, he will go quiet on me. Both by not messaging me for a long time and also in real life. He has sat there before next to me, ignoring me, go silent and stare out of the window/at the tv and ignore me if we disagree on something. What is this about? Is it a reg flag/manipulation?
Guy I'm dating goes quiet/silent treatment on me?
Post Opinion