According to this which I was directed to through this post:

  • From the Third Naruto Databook found under Sasuke’s info: “In the past, parting from Naruto had been as painful as ripping off half of his own body.”

Not parting from team 7, not parting from Sakura and Naruto both, not parting from Sakura alone, because he certainly cared about Sakura back then, so if it was due to ‘friendship’, Sakura would have been included as well. no, nothing that suggests the painful parting was due to ‘friendship’, 

 ”parting from Naruto had been as painful as ripping off half of his own body”

"as painful as ripping off half of his own body"

I am done. 

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