Sounds like the friend is wise to this thots shenanigans and correctly predicted the "professional experience on a project" was gonna be this dudes dick in her friends vagina. After lying to her friend, it's now
totally unexpected that she's getting together with the dude, but pretends like she's just passively going along with it and it's the guy's idea, because poly people have poor impulse control so she thinks that works as an excuse.
Now, she's run online to shit on her unreasonably emotional (according to her) friend who correctly called out her behavior beforehand and seek asspats from one of the few communities that probably won't raise an eyebrow at her lying to her friend or how a supposedly professional work project almost immediately turned into her dating her friends ex. Though,
at least some people tenderly point out she's being kind of shitty so her little "uwu am I in the wrong guiz or is my overly emotional friend being overly emotional with her silly human emotions like jealousy? Did I mention she's overly emotional and I didn't do anything wrong?" ploy didn't work out so well.