Vrftsjtryk

So, I’ve read enough posts to understand how HR works however, after reading several similar topics, I am still unsure of what to do.
I have been a bookkeeper/assistant manager for a very large apartment complex for over 3 years. I have had the same manager who is on site with me the whole time. We are actually good friends, but his behavior and management has been a serious concern since we’ve first started working together.
Our property has changed management companies 3 times since we’ve been there. I contacted HR with Corporate Management #1 around 6 months after starting my position. They never even responded to me but my boss made it very well known that they told him about it. Things were awkward for a while. Eventually I learned how to get into “his good graces” and keep my mouth shut. The problem is, for the past 3 years I have been taken advantage of and overworked to the point that I couldn’t possibly take anymore.
Now, I tried dealing with this on my own for years! Every time I attempted to have a professional conversation about my position and my concerns, I was immediately met with aggressive and defensive sarcasm. A lot of times he would even laugh at me.
Recently, I’ve hit my limit. I’m not exactly sure why. I decided that I can’t do this anymore so I can either quit with no explanation or I can contact HR for help.
This new management company, unlike the others is great with communication. I’ve already spoken with our corporate manager several times. He’s asked me before how I feel about my boss but I always said, “I don’t want to say anything”.
So, I sent my corporate manager an email. Starting out the email with “I have some serious concerns that I feel it is my job to our staff and our residents to make you aware of. I’ve been reluctant to come forward in the past because 3 years ago, I went to Corporate Management #1 and my confidentiality was broken and nothing was done to fix the issues”. I then laid out several bullet points of concerns and said to please not say anything until we can talk.
He immediately called me. The first thing he emphasized was that my name will absolutely NOT be involved. He asked me to elaborate on a few things. The main thing that upset him was that my boss is constantly speaking very poorly of our new management and specifically him. I told him about text messages proving exactly that. He asked that I send him screenshots of those messages. Of course, I did.
3 days later HR shows up (a woman I’ve never met) and she speaks to everyone individually. I already had to cover myself because I was the only one she took for a drive to talk to. Everyone was suspicious of that but I said “I have no clue why she did that”. The next day, the corporate manager was there. He first met with my boss. Then he came into my office and shit the door. He said that he’s been informed that I go around telling everyone that he constantly texts and calls me looking for dirt on my coworkers. THIS IS COMPLETE HORSE SHIT. But I attempted to say that’s not true but he was clearly upset so I just let him talk. He didn’t say much else other than he’s never had a company with as many personal issues as ours. He also mentioned that he spoke with my boss about retaliation and that it won’t be tolerated. This was odd, since I didn’t think retaliation was a concern since my name was not to come up.
About 30 minutes later, the second the corporate manager steps out, my boss comes into my office and says, “what did I ever do to you?” I said I didn’t know what you are talking about. He then says that he was shown the screenshots that I had sent to the corporate manager! He knew it was me since he sent it only to me. I basically panicked and said “I’m not allowed to say anything right now”
Naturally the rest of the day was extremely awkward. I honestly don’t know How we are suppose to work with each other now.
I’m not sure out of all the concerns I gave him, the texts being a smaller one; Why show him the text?! I’m not sure if he even realizes that he called me out. This happened today. So, do I say something tomorrow about the screenshot being shown to him and causing and uncomfortable work environment for me or do I let this go and learn my lesson? This is driving me nuts. Advise is much appreciated.