Is it grammatically right to say just "until you"? Or is anything skipped here?
Yes, there is nothing omitted here. The speaker has used "until you" at the end here to specify that her love was the only one that really mattered to her, but you can use other similar expressions to give the same idea. Ex: I was fine 'cause I knew they didn't really matter until I met you. Ex: Once I met you, I was fine because I knew they didn't really matter.
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