Why did the fictional characters in Pi 2 leave the hostess at the airport?

In Pi 2, the fictional character is Aunt Qian and the female caller is Lin. Qian Sanyi University was excellent in four years. He went abroad for scientific research with his tutor. Qian Sanyi admired his mentor very much, but the mentor died for some reason. Qian Sany was hit hard. He didn't trust his tutor and died, so he began to do experiments crazily and devoted himself to experimental research.

At this time, because Lin wanted to surprise Qian Sanyi, she went to the country where Qian Sanyi was located, but during the flight, all the planes were grounded because of the volcanic eruption in this country, so Lin panicked. She kept sending messages to Qian Sanyi to explain her recent situation, but no matter how Lin sent messages, Qian Sanyi didn't reply. Lin can't speak in a strange country. She is very hungry. The airport is still very cold, but there is no news of Qian Sanyi. Lin thought that Qian Sanyi didn't want to pick her up, and her heart was dying. But what she doesn't know is that Qian Sanyi has been immersed in the experiment. Because of the death of his mentor, he closed his inner world, and he got mental illness. So, Qian Sanyi sent Lin to a strange country, a strange city, and there was no news of Qian Sanyi.

Lin is really sad. It turned out that everything was her own will. She felt that she deserved it and should not be so willful, so that she would not be hurt. To this end, Qian Sanyi has been pushing all the faults on himself. He regretted not being with Lin when she needed help, so Aunt Qian's illness became more and more serious and even began to develop in a bad direction. Fortunately, he has a doctor in his heart.

Aunt Qian always wanted to go back to China and explain it to Lin, but she was afraid to face Lin. The thought of that day made her heart ache. Actually, I can't understand such a thing. Anyway, Qian Sanyi lost Lin. He left her in a strange country, still in the cold night.