What the main reason why a guy would block a girl?

Anonymous
If a girl that you were getting to know long distance breaks it off with you because of something bad you did and you swore that you'd never call her again but you told that she can message you but it won't be consistent but you ended up unfriending her and so you don't hear from her in 2 Months and she reaches out to you but you ignore her text so she blocks you and you call her from a different number and she calls you back asks you for a book.. she's never rude very polite about it and all you are is rude to her by having an attitude and when she says thanks and have a good night, all you can reply with is "mmmm hmmm". What does that mean? And would that result in you blocking her?
What the main reason why a guy would block a girl?
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