Is it immature to delete a girl on snapchat?

Basically, I had a huge crush on this girl for several months (almost a year), and the first time we met she was acting really nice to me. Her body language made me think she was into me because she looked at me frequently, and played with her hair. She smiled a lot, and replied to snapchats all the time, as well as texts. However, about four months ago she quickly lost interest for a reason I have yet to figure out. She rarely responds to texts and does so in an uninterested fashion, and never replies to snaps. I try to send her things she might find funny or entertaining and I never get anything back. She still watches my stories, but I feel that I need to stop thinking about her for my own well-being. Is it harsh or immature to get rid of her to help me think about her less often? We still go to school together so I'm kind of worried about having to see her again and have her be mad that I did what I plan to do, but at the same time I wouldn't be surprised if she never even noticed. This one incident kind of adds to the frustration I'm feeling from not receiving interest from girls that I like
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Thanks for your opinions guys. It's one thing for a girl to just not reciprocate feelings, but a whole other thing for her to be blatantly ignoring me for no good reason. Can't be wasting any more time caring about people who don't care about you
Is it immature to delete a girl on snapchat?
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