How do I get over getting dumped by someone I truly loved?

I was convinced he was the one, everything was going perfectly, than he dumped me out of the blue for a friend of his who had a crush on him for years who’s objectively ugly as fuck, that makes it even less understandable for me... he just stopped talking to me from one day to the next, I can’t get over it
How do I get over getting dumped by someone I truly loved?
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