My ex got married months 7 after our breakup and I don’t know how to not internalize this?

My ex of 6 years got married 7 months after we broke up, and years later I still struggle with it. I’m desperate to just move on and I don’t know how that’s possible? I also want to get the perspective of men who moved on quickly after a breakup?

We started dating in our early 20s. He was my first serious relationship. He cheated about a year in, begged me to take him back, and I did. The last 3 years were long distance, and toward the end things became really unhealthy. He became distant and would sometimes call me drunk and suicidal, and I stayed partly because I was worried about him and felt responsible for him.

The last year we were together, I had a health scare and that's actually how I found out he had cheated on me again (I’m ok now.). When I confronted him, he denied it, cried, and tried to turn it around on me. I was so exhausted and confused that I started feeling like I was going crazy. And stupidly, I still stayed.

He brought up that I should move to the same state with him and the benefits of us getting married when we just started doing long distance. I wanted to prioritize my career though in a state where there were more opportunities in what I do, so while I agreed it was something we should do eventually down the line, the topic fizzled out for a bit. The last year or two though I was the one to bring up the topic, and how I'd move to his state if we got married. His sister-in-law had even told me the last year we were together, "The ring is coming soon so be prepared." Instead, after another drunk suicide call, he told me he wasn't ready for marriage or kids and wasn't in the right headspace. After 6 years, we ended through a text.

About 7-8 months later, I found out he had married a woman from a different country. From what I understand, they met around the time we were breaking up. A couple of years later, they had a baby.

He told me he wasn't ready for marriage or kids, yet built the exact life I wanted with someone else almost immediately. I see his wife a representation of everything I lack and what he always truly wanted. Maybe what most men would want. Beyond her being beautiful, she seems so optimistic, happy and strong even though it seems she came from harder times.

I know this is my own fault and I feel like I was a placeholder. I don’t love him yet I think about what he did to me everyday, it’s constant anxiety and depression at this point. Also,  I want to give a disclaimer that I posted this on other threads. This is my way of just venting while I seek help.