<human>: My gf and I are both in college and have been dating almost 2 years. Her 21st birthday was this week. The past couple of weeks she has been acting weird by not acting as interested  in me and also acting somewhat distant. We still have been texting frequently but the conversation has been dull, mostly on her end... (No energy or enthusiasm in texts..)

Anyway, things were picking back up like usual and she claimed it was because of finals and stress that she was acting different. For her birthday I got her a nice bottle of wine and her favorite tv season and I also offered to take her out... however, I said we could go to a friends party or go to a movie or something. She said, "okay I'll think about it. Goodnight." and never responded back to my texts after that.

I guess I could have organized a party or something for her or done something more memorable for her 21st, but with finals coming up this week and a small budget to work with, I don't know what more I could have done. 

Is it really just the stress from finals or is she ready to move on? Should I have organized a small party for her with her friends?

Provide a brief overview of the text.
<bot>: GF just turned 21, has been acting distant, I didn't do anything 'memorable' for her for her birthday and she seems like she's ignoring me but blames it on stress from finals. What's going on?