Am I the Asshole?

The original post: /r/amitheasshole by /u/Anxious-Tip7772 on 2025-04-16 12:15:34.

So my friend let’s call her K has been seeing this girl we’ll call her person A for a few months now, but previously K also started talking to another girl let’s call her person B. K started to talk to both of them at the same time, but became more serious with person A than person B. K went on a trip to visit person A, but was also texting and calling person B saying that they miss them and can’t wait to see them. But person B ended things with K.

I have hung out with person A and really like them a lot. Should I tell person A that K was talking to person B on their trip? Even though K and person B are not talking anymore. To be clear K and person A have been exclusive for about a couple months now.