I specifically said I wasn't excusing her actions, I was just giving my take on her from a storytelling perspective. Sometimes, characters do awful things in order to tell a specific story or send a specific message, and I wanted to share what I felt that message was.
First things first let's look up definitions:
Excusing:
seek to
lessen the blame
attaching to (a fault or
offence); try to justify.
empathetic
/ˌɛmpəˈθɛtɪk/
adjective
showing an ability to understand and share the feelings of another.
Her take on all of that is obvious for many, hormonal last ditch effort to sabotage everything between them. I can also be empathetic since i've done something in similar tone.
I had a thing for a girl, she ignored me but i knew she liked my friend. So i just straight went to him and told him about her feelings. It was one of those stupidest things i've done during my teenage years (15-16). I felt immediately bad after that (i was drunk too), to this day i still cringe at the thought of what i've done, despite living more than double the years it happened. It was done with malicious thoughts, just to please me. If they get together ok, i didn't care but i wanted to get it over with, her indecisive behaviour gave me hope and I decided to squander her hope or give her a push (hoping for the 1st).
This behavior doesn't need understanding, excuses or empathy it was straight up bad and evil. As for FMC her behavior is 10 times worse than mine. And instead of trying to make amends she also made cowardly retreat with the help of his friend (who isn't a good friend towards MC TBH).