you have gone from slave to mistress LR, shit, I missed something there.
I agree, without knowing the rules that you have over you as a slave, then it's hard to answer. Perhaps the better thing to ask is, are you cut out to be a slave?
Sure you can be emotional, that is human. To be a slave though, it's masters rules, regardless of what you think and want. birthday or not, he is the one that owns you and decides what you do on your birthday.
It could be that he was testing your strength as a slave to see if you are really worthy of it, or he could be a selfish prick. No one knows but you and him...