<human>: I found out my girlfriend had been developing feelings for another guy. I found her secret tumblr and it had all these posts about how she finds his scent so comforting and how she wanted to kiss him really badly. We both know the kid as he is part of our mutual friend group. She didn't act on these urges but I still felt betrayed so I left her. 

I should add that when I confronted her she adamantly denied these and told me that she wrote those because she was "angry and not thinking rationally". Was that a cop out on her part?

Give me a shortened version of the text
<bot>: girlfriend of 2 years has secret blog, posts about how she's developing feelings for another, I leave her but dont know if I did the right thing.