How do I get him back

Me and him were together for about 6 months. I made the mistake of trying to be friends with my ex once and had very small communication with that same ex again months later. That ex was someone who was on and off within a year. My ex was the one person in the world he didn’t want me talking to but I didn’t realize that until he clearly told me 2 months before he broke up with me. I pretty much lost his trust which caused him to fall out of love with me. I changed my actions those 2 past months because I wanted to prevent him fully losing trust in me and a breakup, but it wasn’t enough to keep his feelings. After he broke up with me, one week later I wrote a letter telling him I’m sorry and at the end said “If you still care about me the slightest bit please reply” I received nothing back. 1 week later I texted him asking if he read it and he said he only read some of it and words on paper means nothing, so then that day I forcefully talked to him in person to try and understand the full story of why he broke up with me. It’s been about a month since the break up and I’m still having nightmares about him, I’m eaten in my regrets and I have no idea what to do with myself. I have to walk past him at least 6 times a day in school and we have one class together. He ignores me completely, and haven’t said one word to each other since. I’m still utterly in love with him but have no clue how to get him back. I would love to invite him to an event he enjoys, as a Christmas present but I’d be me and my parents and I only have a month until I get those tickets. I need advice, I’m confused. I was his first REAL love and he was the first person to treat me perfectly and became my other half.

It sounds to me like he does not want a relationship at all with you anymore. Why don't you just move on or try to become friends with him again then try fit a relationship again