Friend randomly didn’t want to be friends

I 19M was close friends with a 19F who I met in college. We did lot of stuff together and our mutual friend group. We studied together, hiked together went to lectures together etc . At the last couple of weeks she kept seenzoning me and eventually told that she can't b friends with me anymore via text. I asked whether I did anything wrong and she told that I didn't and I have nothing to apologise for. However when I meet her physically she seems to be normal like nothing happened. I feel terrible.So guys what happened? Did I do something? What should I do?