Task: Question Answering
Input (English): I certainly don't need someone who keeps nagging about loosing weight all the while rejecting to do anything against it . So when this other more solemn but dear friend of mine approached me to do the competition with her , I would have been awefully stupid to say no . So yes , I behaved immaturely not to tell you that you are a lazy , fat , depressed person and that I could no longer stand the sight of you ... but would it have changed anything ? No , cause you're so incredibly full of yourself . 
Question: Why did I behave immaturely ?
Output (English): I was angry at you for being selfish .