Why would you block someone on one platform but not all of them?

A guy I was seeing was giving me bare minimum so I told him I done and he blocked me. Instantly blocked me without saying a word. But only on one platform. Why not on all of them? I miss him but feel like it would be weird to message him somewhere else and to try and work it out now.

Why would you block someone on one platform but not all of them?
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