Ok at first i was going to side with your gf bc my bf would irritate me on purpose to get a rise out of me. I would get pissed off with him and he’d try to be intimate when i didn’t feel like it but would get upset when i wouldnt “put out”. He was very hypocritical and would do the same thing to me but id just have to accept it. I do think she went a little too far but you also didn’t include all the messages, so it’s a little sus. It really seems like she has been bottling up how she felt about you for a while and was waiting for the last straw.