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A person who forgets your birthday and then acts like it's a big deal when they finally remember.
I texted you 3 times on my birthday. You replied the next day with 'Oh hey, I forgot your birthday.'
You didn't show up to my party. Then you texted me 2 days later with 'I had a bad day, so I forgot your birthday.'
You said you were going to remember my birthday. Then you forgot it. Again.