Should I send her a text saying "Sorry that I am bothering you I won't talk to you again." Im upset?

Im really just trying to be nice to this girl I used to sit next to in class. We used to be friendly until she stopped talking to me. She used tell me a lot about herself and her family. And she would always be like "Yay your here!!!" When I came to school. I haven't talked to her in real life for months. Even when I sat next to her I didn't talk to her. I used to like her for a month but I dont anymore. Whenever I text her most of the time she never responds. When she does answer after awhile she will stop texting me in the middle of the conversation!! I dont know if she doesn't want to talk to me or not and if she doesn't want to I wish she would tell me. I dont know if she thinks I like her because, I never gave her compliments, never touched her, never flirted with her. I did give her a birthday card and my cousin hacked my phone and sent her a "merry Christmas cutie ;)" text. Im really annoyed and I dont know if I want to talk to her anymore. Should I send her a text saying "Sorry that I am bothering you I won't talk to you again." And delete her number because I am really annoyed because no one has ever ignored my messages like she has. I know she is an AP student and does community service but she could just text me back saying she is busy!!
Should I send her that text and never talk to her again?
Be nice and forget about all those times she never texted me back and finally talk in person?
Ask her in person/text why she doesn't text me back?
The reason why she doesn't text me back is she is busy and I am overreacting...
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Also I dont really text her that much maybe like a few times a month
Should I send her a text saying "Sorry that I am bothering you I won't talk to you again." Im upset?
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