Even if he's talking to you this morning, don't slip back in to your 'normal'. 
As the daughter of a woman who has used the silent treatment and stonewalling to keep me in line I can tell you that you can never find that perfectly phrased statement that will make them see the error of their ways. I doubt he's going to have an epiphany.
What you need to believe now is how the silent treatment suits him perfectly. There are subjects and places where he won't go. Even if the relationship is set up to suit him and you want to discuss something, understand his rationale, tell him your point of view, compromise.............. Normal stuff; he doesn't want that.
He cannot risk a conversation that would leave him having to verbally justify his offence or his sensitivity or his selfishness or an ongoing injustice.
The very last thing a regular practitioner of the silent treatment wants is a ''reasonable'' conversation. They cannot afford that.
He knows that he has no reasonable position. His objections and his sensitivities are all UNreasonable.
By taking offence and giving you the silent treatment though he maintains control in the relationship.
And by denying that he's giving you the silent treatment he is also gaslighting you to believe that the problem is you.
So, as hard as it is after 4 years with him, stop trying to get through to him. Stop trying to be heard. Stop trying to make him understand your position. You can't. Not with words anyway. So stop trying.
Not understanding you and not hearing you is what he is 100% committed to.
You have two choices, accept it and knuckle under his regime.
or walk away after one of silent treatments telling him ''this isnt working for me''.
For years after I left my x I wanted him to understand that I had no choice but to leave. It took me years to understand that that is part of the trauma bond. That is what keeps you there, that need for them to understand you and your point of view. They don't want to. They want to get angry that you don't see EVERYTHING through their unreasonable selfish lens. And no discussion ever.