Angelina broke my heart

I can't really believe it. Angelina broke my heart while I hadn't fallen in her love. Angelina came to the lab yesterday to finish our team's project. She had worn a beautiful t-shirt and jeans, and in one word, she was shining like a white panda! I've never seen her like that before. "She looks amazing. None of our team members have shown up. Why aren't you talking to her?" I thought to myself. I was working on my own project while she finished his part. I was thinking to invite her to a coffee that she said, "I should leave within 20 minutes cause my boyfriend is coming."
"Your boyfriend? He is coming to our university? here?" I asked.
"Yes." She said while she was texting with her phone.
"Oh my god. I can't believe it. She has a boyfriend. Then how can I expect her to spend some time with me? Why shouldn't she be with her boyfriend?" I thought to myself. I really didn't expect it, so I asked her, "That's why you look amazing today?" she said, "I guess ..." while she was thinking to herself, "It is none of your business. Why are you asking me?"

I was thinking about all these things that she printed the documents, and said goodbye to me. I was completely baffled. I wanted to go and walk with her, but what if her boyfriend saw us? She left the lab thinking to herself that what am I thinking about. I couldn't even answer her. I came after her, and she was talking very slowly. I wanted to run, and talk to her, but I found no reason. I just watched her going far and far until I couldn't see her anymore. I came back to the lab, and I didn't know what's happened. "She is like me in some aspects. She is sober and sedate. She walks calmly." I thought about her. "But she really don't care about me. How stupid was I? I made a big mistake by not talking to her two months ago. I should have known it when she started texting all the time, and had no attention to me anymore." I said to myself.

I was frustrated. I couldn't even finish the project. I took a bus, and went home. "She has a boyfriend? So what? I was not going to be her boyfriend. All I wanted was to be friends. I expected her to at least care about me as much as I care about her." I thought to myself. "So what? Did you really expect her to spend her time with you and not with her boyfriend? Did you want her to come with you to the movies and parks instead of him? Why should she do that? She is 22, and she should have a boyfriend to marry. It is natural that a beautiful girl at her age to have a boyfriend and marry. Many Americans are like that." I answered to myself. Suddenly, I remembered that I didn't even thank her for printing the documents.

"Hey, I just forgot to thank you for coming and helping. If I could do anything for you, please just let me know. Have fun." I sent her a SMS.
"Thanks np :)" she answered instantly.
I put the sentence "If I could do..." to see her reaction, but she didn't care at all. "Why do you send me smileys when you don't really care about me?" I asked her in my imaginations.

 "I didn't love her; I didn't even know her, and I had never talked to her. But she could break my heart. How is this happened?" I asked myself, but I had no answer for my question. I felt very lonely; I remembered all my previous heartbreaks, and fell into sleep.