How to know if you're really done with the relationship?

The last time I broke up with my ex he ignored me for a day and then we got back together, this time he broke up with me and is ignoring me, been about a day or two, how do I know that his moved on or not because before ignoring me he said we could be friends, what do I do, any suggestions or advice would be appreciated
How to know if you're really done with the relationship?
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