How to move on after being ghosted?

This guy and I were in a "situationship" (we couldn't be together for many reasons, distance being the main one) for 3 months. During that time, we talked every single day, sent each other pictures of what we were doing, had some spicy time over text, talked openly about our past relationships and why they'd failed, etc.. He promised me he would come to see me where I live, he told me I was worth everything to come see, that we had clicked a lot, and that coming to see me was one of his priorities, that I'd become important to him. I told him I was a very anxious person and that I needed reassurance in my relationships - both friendly and romantic ones. And he happily delivered, calling me all sorts of pet names and telling me I was beautiful or cute almost every day. I listened to his problems and gave him genuine advice. I was insanely attracted to this man, and from what I could tell, so was he.

And then on a random Thursday morning, he ghosted me. Since the day before I could feel something was off, he just ignored my snaps the whole day even though his snap score went up by like 200. That morning he opened my last snap and immediately after removed me from his friends. And then radio silence. It's been 3 weeks and I'm having a really hard time moving on. I of course knew that it was more than likely that what we had was temporary, but I never saw it ending this way. I never thought he'd just cut me off like I was nothing, especially after everything we told each other. After me telling him he radiated kindness (I want to kick myself now ew) and that I needed him. After him promising me we'd meet and telling me he was going to send me one of his hoodies so I could feel like he was there.

Even almost a month later, tears are still welling up as I'm writing this. How do I move on from being used like this? How do I forgive myself for being so stupid?

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How to move on after being ghosted?
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