What does it mean when an ex unblocks you on instagram?

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I initiated the break up with my ex of 5 months. He surprisingly agreed with my decision and he told me he was having doubts about our relationship. He then told me not to worry since he won’t be heartbroken. After that he blocked me on Instagram immediately but just 2 months ago I noticed that he unblocked me. We’ve been doing no contact ever since the break up so I’m wondering what this means? He never initiated contact after our break up and so have I.
What does it mean when an ex unblocks you on instagram?
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