Right now, i feel like a stranger to her

last night, we had a fight. well sort of. i dont really know what happened, but on the phone she had suddenly burst out into rage and hung up on me. now the next morning, she didnt bother to message me and she seems different towards me. i feel so much guilt for something i dont know that if i did. im no stranger to this feeling. i felt it for 2 years straight in secondary school, but that doesnt mean im used to it or numb to it. it still affects me to no ends. its so unlike her. and i dont know what to do.