Why do people get mad when you call them out on their bs?

My female best friend use to text me everyday when I I had a girlfriend but now that am single it's like she forget am even alive. I called her out on this 2 months ago which only made her mad , now I only hear from her when she needs something so I stopped replying to All of her messages.. the last time I heard from her she told me her boyfriend may leave since she cheated on him. I voice many time to her that I needed her to message me more as i was going through a bad break up but she would always say she's busy but she's a stay at home mom has been for years. She is now mad I blocked her on social media after not hearing from jer for 2 months
Why do people get mad when you call them out on their bs?
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