I need some advise (HELP ME) lots of detail here?

i started to talk and hang out with this Spanish/asian girl in my class in college. She asked for my number. Then we started to chill at the mall or fastfood on our break. I gave her company after class till her ride came. Some time she texted me saying she was at the library. She said I was nice and also said don’t let me take advantage of you, and she was a *****. So I started to text her slowly on the weekends funny jokes and I used to get a reply. I did every possible thing in my hands to cheer her up, we did Always what she wanted never forced her for any thing. I bought her drinks, picked her texts books, class notes and stuff. So one day she was talking about some movie then I said “hey u want go watch it?” she said sure text me, I did but “no reply” We were still hanging out I noticed she was always texting and acted like she didn't care what I had to say or answered in yes or no, as if she was ignoring me on propose. Then out of nowhere she just stopped replying to text or took hours to reply, and started to put {!} After every text. Bec of that I really started to fall for her hard. we never did any class work nothing never. I never waited for her after class she waited for me to come out still, I did so much for her even wasting my own time to get a laugh or smile on her face bec it made me happy even tho I wasn’t. I sacrificed my own time and gas on my car to drive her around and make her happy. I kind of got the point she wasn’t interested i guessed. then finals week was coming close and I was really started to get to work on my class and I tried to help her bec I cared. I tried to do my best to help her.(she asked me to pressure her to make her to go to extra help and threw the class) I started to constantly text her about the class, the important stuff like extra help, the learning classes and notes . I told her com but she barely replied to me acted as if I never even texted her or said she was busy but she still waited for me after class, we still hung out at the mall and chilled after class. I asked her to the movie again. Then the last 3 days of class she started to act like she didn't even no me, then she acts like I'm annoying her or stalking. She tells me this other kid likes her(I think to make me go away), that is what killed me I really liked her and I lost all focus. She texted me day before the final and said “com sit next to me and help “, so I did help her I couldn’t focus on any thing. After the exam I went up to her to ask how she think she do. she acted like she wanted me to **** off she kind of flipped out “y don't u go home“, it's not like something new I always gave her company after class she acted like she just met me or I was stalking her or something. we found out we failed the class and she was kind of mad a out it and I had this mega guilt that I failed her she indirectly blamed it on me. last day she say i guess i will see you not even a thanks, as if we weren't even friends 1 week ago vacation started and I said to her hey can we meet up and talk about the class I really feel terrible and guilty about it no reply. Then the other day I said hi no reply. I guess she is ignoring me on purpose