Does it mean anything if a guy remembers a girl's birthday without any reminders?

Anonymous
This guy and I used to really like each other, but he had to move states for work so we never got to be together. We ended up ending our friendship because it was too painful to talk to each other and not be able to be together. We haven't spoken in months. The other day it was my birthday. He sent me a Happy Birthday text for my birthday. I was just wondering if it could mean anything that he remembered? My birthday is not listed on Facebook or anywhere else. Do guys normally remember girl's birthdays from their own memory? I remembered his birthday, but that was only because I still liked him.
Does it mean anything if a guy remembers a girl's birthday without any reminders?
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