Why does my ex still refer me as his partner?

He broke up with me three years ago. I know he still has a lot of love for me. Recently I saw him refer me as "his partner" and posted a picture of something I gave him few years ago after he broke up with me. He has me blocked everywhere, but I looked at his page through a burner account and saw he still refers me this way.

Why does my ex still refer me as his partner?
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