<human>: Can you condense the text into a few key points?

I met my current girlfriend back in September and things progressed pretty quickly we spent lots of time together (probably too much) very quickly but it was fun and exciting and what not. I went home for winter break (graduate student) and when I came back things did not feel the same but continued normally.
 
A couple weeks ago I started a pretty big project and got very busy, I let her know I would be busy and working more and it would be easier if we didn't see each other every evening. By the time the project was over I realized my work was much better and more focused than usual. I also noticed that I was much more excited to see her after having a couple days to myself. She however was not very happy about those days. I came to the conclusion that between school and seeing her everyday I'm getting burnt out. We sat down and chatted about it (we agreed early on that our careers would always come first) and concluded that 3-4 times a week would be much better than every day.

That was fine and dandy but now that we are doing this she seems very very very bitter, and passive aggressive about not seeing each other every day. I tried talking to her about it again and it was the same conversation as last time she agreed and it went right back to the bitter / passive aggressiveness. 

Is there a better way to approach this? It's been about 3 weeks and she's normal in person but right back to passive aggressive if we don't see each other for a day.
<bot>: Between school and girlfriend I'm feeling burnt out, need more space, girlfriend said it was fine but it isn't.