(English is not my native language. Sorry in advance)

We were in a long distance relationship for 20months, I flew 6k miles to see him for the holidays last December. We looked forward to that day. We were so happy. We traveled around the city. I met his whole family and best friend. We had an amazing time. Then came January, I had to go back, and we were hit by our reality. We're back to talking on the screen. We thought seeing each other again will strengthen our relationship, but we felt like we regress. A lot of miscommunications happened in a month. I felt the hopelessness on both sides. I also struggled a lot at work, I was really stressed out and that took a toll in our relationship. I unconsciously dumped my stress on him. He said that he was tired of me being angry and sad 'all the time'. That pretty much ended our more than 2 year relationship. We probably both gotten tired of the distance, being away from each other. I blamed myself for what happened that day since it really triggered the separation. If I was not feeling lonely or if I have communicated better, probably we're still together.. We broke up not because of lack of love, but because we think it's the best decision for our own happiness. We got amazing memories, and dreams for our future. But we couldn't live happily in the present. We thought that if we continued we'll only be more miserable and hurt each other more. Then I found out less than a week after our breakup, he hooked up with his co-worker. I was devastated of course, I felt like I was replaced so easily but couldn't blame him. He felt alone, he said. He probably needed that physical thing which I can't give. What can I do.. We broke up 2 weeks ago. NC for a week. I miss him everyday. How can you adjust from daily texts and quick calls, to zero? It's only been a few days, but I felt disconnected from him for so long already. I miss our hangouts, he makes amazing music btw! He's really talented, and passionate, which I really admire. I couldn't hate him even after what happened. How do I move. on from here