First, I feel bad for your situation. He could have at least explain why he's stopping contact. It sounds he doesn't deserve your attention. Since Covid is ending, people are starting to go out again. Although some people have stayed in so long, they forgot how to socialize. So it might be time for you get out, maybe just with your friends. Once you meet good people, you will forget him and you will be glad, it was broke off. Another solution (that people don't like when they are huring) is to find activities you like to do and meet other people there. I hope it works out and you meet people you deserve.
(Also, you put your question in the 'Science' Category and may explain why you've received no other answers)
They have many Categories for Relationships