Dating Soulmates

Whenever anyone asked, the foreign guy acknowledged the Chinese girl was his student. She thought they were “friends,” or even more than that, she considered them “soulmates.”

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While I was searching for the appropriate translation I came across some ways to say ‘ soulmates ‘ but none seemed to really express the exact idea. Is there an exact equivalent? And, if not, which word/expression is the most close in meaning?

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