I don’t mind the faithful-best-friend-that-stays-close-to-the-paired-characters role at all. But to have it be hard-coded as the purpose of that friend’s existence? That – that is horrific. And Cori Falls sees nothing wrong with an independent, intelligent, inquisitive being winding up forever slaved to one couple for the rest of his life, all that he is or could be paling in comparison to his caretaking of the One True Pairing.

See: Shawn Hunter to Cory/Topanga in Boy Meets World. He's the biggest C/T shipper there is, and he still has a life and identity of his own. Granted, at one point in season 5 he does tie his well-being to the status of their relationship but it's portrayed as "unhealthy, yet justified" in that he has a reason to be so fixated on them (seeing them together gave him faith in love and relationships), but despite that he's clearly not all that sane for being so obsessed (as seen in the episode "And Then There Was Shawn").