30 Rock + TV Tropes
↳ ’Platonic Life Partners’ with Liz Lemon & Jack Donaghy:
This is when two characters have been friends for a long time, and share a closeness like that of a long-term married couple. Occasionally, there are individuals who assume the duo are married or dating, or wonder, “Why aren’t you guys dating?” or try to set them up as a couple. However, the duo is perfectly happy just being friends, and the lack of sexual attraction is mutual.
The reasons behind this vary. Sometimes they’re truly in love with someone else. Sometimes it’s just how they feel. Sometimes they even tried dating once a long time ago and realised that they just don’t think about each other like that. Whatever the case, the final result is entirely platonic on both sides.
Usually, their relationship with each other is the most important relationship, with even romantic relationships coming in second.