How to ignore your crush without making it too obvious or rude?

emmazaz
i like this guy in my class I know him for about a month and a half we rarely speak to each other but I catch him looking at me several times after I knew that he have a girlfriend I stopped looking at him or giving him any signs I kind of ignored him to get over him but then he ignored me as well .

was I rude? he would talk to every one but me .or is he just not interested and its all made of my imagination? I really want this awkwardness to stop .

how can I avoid him without being rude?
How to ignore your crush without making it too obvious or rude?
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