Why do some girls get upset so easily?

Wolfie128
So i am 19 and there is this girl (she is 20) i like a lot. And she probably know that i like her, i think she likes me too but who knows. We are just talking and chatting with each other that's all. The thing I don't understand is why does she get upset so easily. She won't talk to me, she ignores me etc... I do like the smallest mistake such as: did not answer her question ( i was doing something) or i don't even know. Just small things so to say (not that imported). I mean she has made those same mistakes (not answering a question, etc...) i was always cool with it. I did not get mad or upset. Please can someone explain to me. Thank you.
Why do some girls get upset so easily?
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