Why do this guy started blocking me everywhere but still claims to love only me? He doesn't let me move on and plays with my mind and guilt trips me?

I wanna move on from him to another guy but he doesn't let me by claiming that I'm his only love and makes me feel bad to get an impression to everyone that I'm cheating on him when I don't wanna cheat on him and stay loyal to him he ignores me, blocks me, provokes my anxiety and when I finally want to move on with a new guy he doesn't let me and claims them that I only belong to him. What should I do?

Why do this guy started blocking me everywhere but still claims to love only me? He doesn't let me move on and plays with my mind and guilt trips me?
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