I'm loosing my mind and my heart is aching non stop.

I got crush on someone at my 3rd in university. I didn't even know his name because I saw him on arts building so I understood that he was from different department. Then I tried to find him everywhere but couldn't get him. Then after a month suddenly on our university fb page I got to know that he became a TA from his department and also got his name. I went to his fb page and tried to find if he is in a relationship but there wasn't any clue about it. So I was kinda confused. Then after another month I got to see him again in library. And I got so excited because I am extrovert and people can understand me through my actions and expression. He kinda noticed that. But suddenly a girl came to him the way they were talking I understood that they were in a relationship. But then one of my friend's gf knew him because they were from same department so she asked him if he is single because she knows someone who likes him and he said no he is not single. But he was so eager to know the name and department of that person which was me. So next week there was festival organized by his department so my friend's gf told that she will just introduce me to him as her friend so I went with her because I have never saw him face to face. So just for once I wanted to see him. But my friend was also present there at that time and he literally said Infront of him that I like him. He and I both were so embarrassed. He didn't say anything at that time. I tried to forget about this because it was really embarrassing that crush knows about me. Then after that I ignored that friend also because not because of this event but also he was kinda toxic. After that I got to know that his gf also told my crush my name which I told her not to say. Then I didn't I see my crush but at the last exam when he was getting out from university and I was going in at the same time he was staring at me. Okay after that our semester completed. I tried to forget him and it was kinda successful until the next semester started. Our university is open credited and he is in his last year and I am in my first and also we are from different department so I didn't think we will meet again. At the very first day of our semester we met again. And it was funny because his expression said to me that he recognized me immediately. After that we had encounter every week and he will stare at me. I tried ignore that but my heart and mind can't deny it. I think he kinda likes to emotionally bully me because how much I try to ignore it but as I said my expressions always says everything. This semester is also completed. I don't know if I will meet him again because I don't want to because the way it was so easy before but after happening so much encounter with him I don't know how much I can handle. I needed to burst out everything so I did. That's all.