I need help with the girl in Math class please

So, i have been liking this girl ever since i saw her which was on the first week of classes. I am very shy especially when dealing with girls. I took me one month to make myself of notice to her. i didnt talk to her but i waved and smiled and she did the same as well. the next week she and her friend sat behind me and the girl i like asked her friend " whats his name?" and her friend replied saying my name. Howver, eventhough i ovrheard my name i still didnt went and talk to her. i then took 3 month to approach her and when i did she smiled and laugh and it was wonderful. her friend was like " yes, he finally did it". since appoximately 4 months has passed since i saw her almost all my friends knew i had a crush on her and it was great big one. the following week from our first conversation, she accompanied by her 2 friends were seemingly waiting by the door for me to talk to her . Yet again my downfall is shyness and i walked passed by her. but still i manged to talk to her on social media for 3 days per week on average. and sometimes in classes as well. to me it was good progress. After talking for two months i decided to ask her out and she was like " not really , i lm not interested in going to the movies" and she did not reply to future texts. I attempted to keep what we had ( a friendship, crush, whatever we had cause it seemed as if it was fluctuating) to a stable unit. she neglected me and it seems as if she doesnt care anymore. For a moment i thought she liked me and all my friends and her friends did cause they were all gossiping and in on it. I really don't know what is the case. Is it cause everyone knew that i liked her and i wasn't taking her on seriously. or was it that she got too tired of waiting for me cause the truth is that many guys want to be with her? Or is it anything else? Btw she does not attend this class anymore since she no longer has interest in me or at least that is what i think. ironic or not?