Hi. I don´t think, you should take it too seriously or personal. People are busy living more or less hectic lives and birthdays are one of the things most easily forgotten, if you haven´t made yourself a reminder.
If someone has given you the "come cry on my shoulder" -signal, you should take that person up on it, when the time comes and make sure, that you give the same signal yourself.
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Femaline
Special Interest: Beethoven