a big difference between yestonight and tonigt

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Everything goes very well till yesternight. We went for a very quiet tea house. We talked, laught, everything is so freely. And we were also very happy yestonight. But, tonight, all seems changing. I sent several messages to her, but she did not reply any. I have heared that it is very difficult to grape a girl's understanding. Now, I fimly believe while it makes me very tired. Are you a girl or a boy, could you talk something when you fall in love some one? I need help, thank you.