Why Angelina?

I expected to walk with Angelina after our class to the next class. I waived my hand to say her hello. She just said hi, and didn't smile like before. 

"We have nothing to say. Don't walk with me." She said to me in her imaginations. 

"I had no time to print the last document. Would you mind to come with me and print it?" I asked her. 

"I printed it before our class" she answered me. 

"Now, Go." She said to me in her thoughts.

I left her, and went outside the building to breath the fresh air. I left the second class earlier to wait for her. I stayed outside the building to walk with her toward her car. I was playing with my cell phone, and waiting for her. I saw her coming out. I waited a few minutes, but she didn't come out. I looked back and I saw that she was disappeared. "She has changed her way because of me. OMG, why? She used to come and talk to me, but now..." I thought to myself. I went back to find her, but I faced my professor. "Are you free now to talk about that research now?" He asked me. "Sure." I answered while I was thinking about her. "If you don't like me, at least be the same." I asked her in my thoughts.

It is almost end of the semester. I have two final exams next week, and I should study for them. I have Two projects and one another final exam in the next two weeks. By the end of this month, I should also pass two qualifying exams that I didn't finish their study yet. I feel lots of pressure and stress these days. That's why I think Angelina has become an issue for me. I wish she could understand me. How cruel is she?