Blake Lively did not publicly do something proven to Taylor Swift in the sense of a confirmed betrayal or attack. What’s been reported is that Swift and Lively’s friendship reportedly cooled in 2025 after Swift became tangled in Lively’s legal fight with Justin Baldoni, including court filings and leaked text-message claims that drew Swift into the drama.

What the reports say

  • The main issue is association , not a confirmed personal wrongdoing by Lively toward Swift. Reported court documents said Lively’s name and messages involving Swift were referenced in the Baldoni dispute, which put pressure on the friendship.
  • Some outlets have claimed Swift felt used or dragged into the case, but those are anonymous-source reports , not verified statements from Swift herself.
  • Other coverage says Swift was only connected to the film through licensing a song and was not involved in creative decisions.

The likely takeaway

The safest read is: Blake Lively allegedly involved Taylor Swift in her legal mess, and that seems to have strained their friendship. But there is no solid public evidence that Lively “did” one single clear-cut act to Swift beyond that reported fallout.

What’s still unclear

  • Whether the friendship is permanently over.
  • Whether Swift personally felt betrayed, beyond the reported insider claims.
  • How much of the online chatter is based on facts versus gossip.

In short: the story is about a friendship fallout tied to a legal case , not a confirmed public offense by Blake Lively against Taylor Swift.

TL;DR: Blake Lively appears to have pulled Taylor Swift into her Justin Baldoni legal drama, and that reportedly strained their friendship, but there’s no confirmed public proof of a direct personal attack on Swift.