Breaking the silence without losing your sanity

The dreaded silent treatment. I'm sure we've all been on the receiving end of the silence at some point or another in our lives. I'm writing to you all because I feel like I'm drowning in the silence and the periods where it's not present feel faint and far away.

I've been with my partner for a few years now, we also live together and have been doing so for half the duration of our relationship. From the beginning I noticed that when he became annoyed or upset about something he would immediately wear a cold, stern expression that would let you know something was wrong. During that time he would often go silent and not really communicate the issue at hand. I would try to ask him what was upsetting him, encourage him to talk about what was on his mind. Sometimes he did, most times he didn't however we'd never have a healthy two way conversation, it somehow always felt like I was on the apologizing end all the time.
Throughout the years this became more frequent and more severe. The silent treatment would last a few days, then a week, then weeks. It's been over a year now where we have 1-2 weeks of "calm" and the rest is him upset and giving me the silent treatment.

I have tried to apologize, to let him know I'm available and open to talking or hearing him out, I've given space... and by space I do not mean an hour or two to cool off because there is never a cool down period where his mood levels out and he's able to return to me and talk about what happened. I've given a few days of space and even at that point he doesn't budge.

This last bout of the silent treatment ( now in week 3) has been the worst yet. He will ignore and not respond to my messages or calls, he will not greet me when he arrives or leaves the house, cooks and eats all his meals alone, spends all his time in another room of the house, has not looked at me in weeks and when I try to talk to him, even a simple " good morning" or "hi", it gets completely ignored.
I have never felt so alone in the relationship as I've been feeling now. I'm hurting and it pains me even more that I can't confide in my partner. It also hurts that I can't help but feel as though he's intentionally punishing me and trying to teach me a lesson for upsetting him.

My partner thinks of me as a jealous woman who has an issue with other people, especially other woman. From my perspective, I have tried hard to respect my partner's privacy and have never asked to see his call logs, text messages, I've never asked about the female friends in his life. We don't have each other on social media, I don't have passwords to his personal accounts, I've never personally looked through his phone or computer. I've been respectful, I've been trusting.
Despite that, my insecurities do come through and show in certain situations however these are less a result of pre-existing issues prior to the relationship and more so ones that have been created as a result of the silent treatment or his unwillingness to have open communication.
Every time I am on the receiving end of the silent treatment I feel betrayed, I feel neglected. I feel disrespected. When you feel like your partner isn't showing you respect or care it is hard to not have insecurities on where their love and loyalty rests. My insecurity towards other people stems from being given the silent treatment and during those periods watching my partner treat other people with compassion, kindness and respect.

Ideally I would love to be able to bring up any insecurity I'm having, just to express and communicate it but I cannot because I'm constantly in fear of his reaction and because he hasn't given me many reasons for me to feel confident we can sit down and discuss things as a couple.

Truthfully I feel wronged. I'm always pegged as the bad guy in every situation, I'm seen as this crazy jealous person who seems to have a problem with everyone and everything all because I have a few moments where I am just feeling. I have never yelled at him, given him the silent treatment, started a fight with him, attacked or accused him of things, refused to talk or listen. I've never sworn at him or used profanity. Never intentionally ignored calls, inflicted pain intentionally. Honestly I've never had a moment where I felt entitled to be angry because any shift in mood that he deemed negative he'd become angry and he'd always win.

I've often wanted to attempt to talk about how the silent treatment and the way he approaches conflict affects me and the relationship but I never gain the courage to do so because that would mean he'd have to be open to taking accountability as well and in the 4 years we've been together he has never apologized after an argument or any period of the silent treatment. In retrospect I've always been the one who had the anger directed towards them, the one at fault.

I feel depleted and broken.
I don't understand why this is happening or why he's choosing to treat me this way.

Normally I would ask if you two have talked about it but it seems you have gotten to that stage already. So, let me ask another question, a hypothetical: If your insecurities were to suddenly vanish, would he no longer use the "cold shoulder" as a means of communicating his feelings?