Grief/separation/lack of understanding

Hello; I am a male, 28 years old. I don't even know where to start but I'll just try and hope someone understands what I'm saying. My ex-girlfriend and I met in 2013 and were immediately hooked, we walked through the park near us every day, laughed, chatted and so on...we were both 14/15 years old and got along very well, she always slept with me every now and then, we got along better and better, we hardly argued and life was more or less beautiful. At some point when we were 18 years old we wanted to move in together and a lot of drama started with her parents, because her parents thought that I was a drug dealer and what not, of course they were against it, now looking back I don't think the parents thought that but rather were looking for a reason not to "let go" of their daughter, but well, we went through with it anyway and then moved in together, only had 1000 in our pockets a month, minus rent etc. But we managed it, even if we Sometimes we lived on the limit, but we had each other. She hasn't spoken to her parents at the moment and has completely broken off contact. Every now and then they've hung something on the door or dropped a letter in, but that's about it as far as contact goes. Fast forward, of course, at some point we both made more money and were better off financially; We moved to another apartment and got two super cute dogs. And she started her studies and then studied as an optician two days a week. We were engaged and wanted to get married after her studies. Every time she came home we cooked together; watched tiktoks, laughed a lot, had our rituals from me and from her, what we liked to do, some YouTube videos that we saved so we could watch them together, some steam games that we wanted to play and so on. Even though we had been together for 13 years, I and everyone around us still had the feeling that we were in love. Then it started that she wanted to move away, together, firstly to avoid her parents and secondly because she said you can experience more in a city. I couldn't do this yet but we said we'd look for something; first in the nearest town (about 50 km from here) and then we see where the journey takes us, we then looked at apartments and so on.

Then she was partying and I said that I didn't think it was a bad thing that she was going to party, but I would be happy if she asked me if I wanted to come too or something similar.

Then everything took a turn; She said yes, I want to forbid her from doing that and that I don't begrudge her that and that I'm not happy when she's happy anyway, etc. And that doesn't make sense anymore, and from one moment to the next the relationship was apparently perfect; We always gave everything for each other, ended. I moved in with my mom and my stepfather for two days and she simply moved out to the city where she was studying and never contacted her parents again anyway. She then got a new boyfriend pretty quickly (which I think was also the reason for the breakup) and now lives as if I, her dogs, her friends, her family never existed.

I think about her every day, I miss her. We were like Mac Miller and Ariana Grande, so sweet, so happy, so made for each other. I would really do anything to hold her in my arms again, I would also do everything better knowing what I did wrong or badly. But I want her to be happy, I never wrote to her, I never contacted her and I never besieged her anywhere, it was her decision and if my life is worse because of it; The main thing is that she is happy. What I miss most is how she smells, not the Mugler Alien she wore, no how SHE smells. It's been 9 months now and you will forever be my number 1. You were and are my everything and I hope you are happy with your decision. I love you.