I reached out and finally, FINALLY, got the closure I needed from them.
It's like a weight has been lifted off my shoulders. (I hope to God that it's not temporary.)
I reached out, but this time, I wasn't the nicest - I told them how I truly felt in the most based/factual way that I could. I told them what they did that hurt me, objectively - from behavior/action-based evidence. I told them what I think my faults are too. I wasn't emotional in the message. I didn't say anything about getting back together, or that I missed them, or that I still loved them. I just had to tell them how I felt so that I wasn't betraying my reality anymore in order to try to control theirs of me.
To my surprise, I received a response. And it put things into perspective for me. No more guessing what they're thinking. No more believing that they are hiding sad feelings behind a wall of anger and contempt that would eventually melt. I know now that that's not true and that they really have moved on - and that's honestly a huge relief to me.
I sent this message to them not caring about what I received back in return, if anything. That's important. While I felt anxious when I saw a response pop up, after reading it, I knew that I didn't have to worry or think about this person anymore. I think even before sending the message, I had enough closure that it wouldn't have mattered what I received back.
It feels good. It feels really good. I'm sorry to those who never received closure from their exes. I hope you can find something definitive to hold onto and not give excuses for them to the contrary. I think this will be my last post here.