I regret cutting ties after a misunderstanding, but I think he already moved on. does it really happy that fast?

We had dated for a period of time and agreed to keep contact, but his behavior let me to believe he didn't want that anymore, so I ended things. He explained his part, but I misunderstood and it escalated the situation after which he started ignoring me entirely. I have sent a message to express my misunderstanding, but I'm scared he has deleted it/ is ignoring me and moved on already. Does it really happen that fast? It ended 5 days ago.
I regret cutting ties after a misunderstanding, but I think he already moved on. does it really happy that fast?
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