@S0ulReaper If you hadn't noticed by now, it started as curiosity but ended with her falling in love.
There are multiple proofs of this. Like how hard she works on anything like cooking for him. Or how she defends him when talking to her friends(Back when they were first shown).
She was even sad when he said that he got Valentine's day chocolate.
Also, pretty much everyone knows except the dense(?) couple themself. Her sister, her cousin-sister, even his younger brother, her friends. Pretty much everyone.
So romantic feelings exists. No doubt there.
Falling out of love is another thing. But that seems too serious for this manga. It's next to impossible for a romcom with so few characters.