If he hasn't replied to your messages, I would stop contacting him for now. He may contact you later (it has happened to me in the past), but right now, he's not for it.

Number one, he associates you with being inconsistent. He may not believe you aren't going to play the same back and forth game you did before.

Number two, continuing to message someone who doesn't message you back seems needy. I struggle with this- I know how it is. Being that in the past you guys had some sort of romantic relationship, I would believe that you still have hopes. Perhaps he is past it and has moved on.

Number three, from my own experience: maybe if you guys meet it will end in fireworks, or at least friends that have resolved the past. OR- you will leave sad, like I did. I drove six hours to finally meet a romantic interest and spend four days with him. It was awesome. We had fun, got along great, and made me feel like "Whew! Finally, we can move on from the past!" (similar to what you went through.)

I left, and it didn't help anything. He was done with my BS although he was okay with being friends. And still is. But he moved on and it's done. We rarely talk.

My suggestion? Don't pursue it. You're only dragging yourself down. Learn from your mistakes and move on.