My girlfriend always picks fights with me and misinterprets what I say. For instance I will say that next semester at uni we could have a day where we catch up after classes once a week, and she takes this to mean we are only ever going to see each other once a week. I don't know if she genuinely misunderstands or just wants to pick a fight, but either way there is always something for her to get mad at.

I don't want to so much "control" her but genre must be some way to show that I'm not putting up with this bullshit all the time, I shouldn't have to carefully think every little thing through and live in fear of upsetting her.