<human>: Can you provide a brief rundown of the text in within 3 sentences?

18-M I live in US since 2011., 19-F (She lives in Brazil).We used to be a very good couple, happy etc. But one day she cheated on me and told me 1 day after. I was really mad and we stayed about 1 month without talking with eachother. After tha everything was corrected and we were fine. She started to change and getting angry/sad abouth little things and blamed me for making her that wayಠ_ಠ . When she broke up she said she couldn't wait for me till 2013 (february I will go back to Brazil), she also said that she doesn't handle to be angry/sad about those little things.

The problem is... She broke up with me 1 week ago. Now she is kinda SUPER friendly. (let me give you an example, my name is... "Hash"... So she could start a conversation like that "HAAAAAAAAAAAAAAAAAAAASSSSSSSSHHHHHHH, How are you!!?? :D". - dafuq, really? -) I don't want to be rude/mean but I can't be phony being "friendly" to someone that breaks my heart!! Also, I'm pretty sure that she wants to come back with me when I come to Brazil, but really, I'm feeling like a Puppet in her hands.

So, What do I do? Should I tell her what? I'm confused, I don't want to be rude even to people that I don't like.
<bot>: I mean, she broke up with me, start to be BETTER than it was as a GF. And I can't be the good guy that I was before.