<human>: Give me the gist of the text in a nutshell

I made a thread about this in /r/relationship_advice before but this time I just want to hear what you think about it. 

Last Monday my girlfriend mentioned breaking up through text, she did apologize for not being able to say to face to face sincerely. I told her we HAVE TO talk in person if this is what she wants. So she came over and first she apologized again for sending a text and said "*I really like you, not past tense. And this is the hardest decision I've had to make.*" We then talked about what gives her the idea of breaking up. She said it's because I don't care/pay enough attention to her, I agree with her on that and I really really regret it. In the end we decided to have one week period of no communications. 

Today is the end of that one week and she told me she stays firm on the decision of breaking up. This is actually the longest relationship I've been in. I'm really willing to change myself if that's what it takes. 

What I don't understand is that why so sudden and out of nowhere? Everything seemed fine before that Monday. We even slept together (first time) 3 days before she mentioned breaking up. We didn't have sex because stupid me misinterpreted her. We were kissing and foundling around, at one point she was on top of me and she asked "*Do you want me to go down?*" I was like sure if you want, thinking she meant giving oral. But she literally got down from me and went to sleep and then apologize for making me feel uncomfortable. Could this have been the reason?
<bot>: gf of 4 months broke up with me. It hit me out of the blue. Misinterpretation before sexy time might have been the reason? Help