"Ruin the Friendship" received generally positive reviews from critics for its emotional songwriting and sentiments. Nick Savage of the
BBC, Jason Lipshutz of
Billboard, and Carly May Gravley of the
Dallas Observer deemed it the album's best track. Savage complimented the "heart-wrenching" third verse, and Gravley contended that the track could be a classic. Viewing the song as the album's high point,
Dazeds Alim Kheraj and
NMEs Kristen S. Hé lauded the lyrical details as sharp and acute in depicting grief, introspection, and memory.
Alexis Petridis of
The Guardian praised it as "authentically heart-tugging" and one of the album's truly memorable cuts.
Carl Wilson of
Slate and Philippe Renaud of
Le Devoir hailed the track as a reminder that Swift could still write beautiful and moving songs, contrary to an otherwise lackluster album. Other critics also praised the production. Savage highlighted the sound as delicate and soft,
The Independent Roisin O'Connor described it as a "disarming, prettily arranged acoustic throwback". Wood selected "Ruin the Friendship" as one of the better songs on the album and opined that the production was a new direction for Martin and Shellback. The
Los Angeles Times named "Ruin the Friendship" the 19th-best track of 2025, while
Stereogum featured it at number 36 on their list of the 40 best pop songs of the year. On a less enthusiastic side,
The Daily Telegraph Poppie Platt described the track as "sweet" but contended the lyrics showcased Swift's limits of still writing about teenage experiences in her thirties. Wren Graves of
Consequence dismissed the song as "sad and forgettable". == Personnel ==