What does the note my girlfriend gave me called "rotten person" mean?

Does she usually like to use the word "rotten"? Does her usual attitude towards you make you think she thinks you suck? If not, you don't have to pay too much attention to the notes she gave you. Maybe she loves you very much but uses this irritating note to hide her love for you! On the contrary, haha, that means she really thinks you suck, hehe.