I get such mixed signals from her, and then for the past week like zero signals. I'm happy, then go to class with her, and boom, i'm feeling deflated. Like I try and talk with her and she'll talk back, but the chemistry that was there like a week ago just doesn't seem to be there now. She literally won't let me finish jokes because she's already laughing, but it seems like a fake laugh, and then she says "it's really funny" but i feel like she's lying. I don't know, just wanted to type it out, vent my feelings. :/
I know exactly what you mean. I used to get that from my girlfriend sometimes. Most of the time it's because she's in a bad mood... there's a good chance it's nothing to do with you. Next time you should just ask her what's up or if somethings wrong. Depending on her answer you'll find out where you stand with her.