also my intimate friend and soul partner
definitions
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A description of a person who serves as both a very close, trusted confidant and a deep romantic or spiritual companion.ja: 親密な友であり魂の伴侶
examples
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She is my colleague, but also my intimate friend and soul partner.
彼女は同僚ですが、私の親密な友人であり、魂のパートナーでもあります。