"Μου λείπεις" means "I miss you". It refers to emmotions.
If we say "μου λείπει η Μαρία", it could mean "I miss Maria" (because she makes me feel good) or it could mean "I am missing Maria" (meaning Maria is part of my team/unit and I cannot find her).
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.