Ch.49 beg to differ,i'm pretty sure Kei back down on those feelings because Rei feared a rejection and played the "it was a joke" card. She still has those feelings but because dumby Rei is dumb and had to go "joke desu", she think Rei didn't have feelings.
First Rei tries water with all the romance between girls talk, Kei is unwelcoming. Then that slipped confession, the situation gets dangerous, there is the risk it's all over. Then Rei compliments her hair and Kei makes it short the next day, and keep it at it ever since. That's a big slap on the face.
Nothing of that tells us "Kei really likes her that way". And that was before Rei became a clown.
Kei is aware of Rei's feelings, the last chapter all but confirms it, thought it was obvious even before. It's just that Kei wants to keep the distance, and Rei is complying.
That's the biggest bruh i ever made, Don't think that's even a possibility
Well, yeah, it's not that kind of manga.