What are the reasons why girls ignore a boy?

Maybe she is busy with something recently and doesn't want others to worry. Maybe her boyfriend found you too close, so he left you for his own feelings. Please forgive me. Maybe you did something to hurt her. You should ask her classmates and friends about her and make things clear. Maybe people really don't want to be friends with you anymore, but they just don't say it for fear of hurting you, so they stay away. Maybe she likes you and doesn't want to contact you personally, which makes you anxious. You should contact her. Wait a minute.