does she want me? or is she using me?

its my girlfriends birthday soon. and before, she used to be happy with thoughtful sweet gifts. but now...its differnet.

i got her a gift card from a store she really liked. it was really hard to get, it took me forever. and it took a chunk out of my money too...so i thought she would appreciate my efforts, you know?

but it bothered me when she said things like

"oh my guy friends are all spoiling me when you're supposed to do that."

or "since you are my boyfriend you should give me the best gifts. im scared that other guys will give me better gifts than you".

then i told her i would mail it to her after i finished a birthday card i was writing to her. and she texted me and said "dont worry about that, i just want the gift card."

what the eff?

i mean ok its her birthday soon so am i being unreasonable? i mean...i could be. maybe its a once-a-year thing...and its her day not mine so i shouldnt complain about it anyway. but it bothers me.

any opinions on this would help. thanks very much

and another note, she had been my best friend for 2 years before and we became a couple a short while ago. and she never did this before. last year, when we were both single, she didnt even tell me it was her birthday.

anything helps. thanks.