How to cut off an ex that came back?

My ex and i were together for 4 years engaged and all well after 8 months we started communicating again and I’m seeing how he’s loving the single life. I can’t handle not being with him but he says he doesn’t want to be in a relationship with anyone.. how can i cut him off that will make him realize he’s lost me? I need something to show him he can’t come back in my life so easily if he doesn’t want me.
How to cut off an ex that came back?
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