First of all, the male protagonist has normal outlook on life and is well-educated. What follows is a monologue.
I like her very much
She always likes to roll on the neatly spread quilt, and then jump up to give me a kiss; she always likes to ride a small electric donkey to blow in the wind in the cool summer evenings, as comfortable as if she is on the prairie; she always likes to appear on purpose when she is inadvertent, strange and cute; she always likes...
Anyway, I like her very much
It's a pity
It was only later that I found out that she also liked me.
Idea: I suddenly wanted to write from the male protagonist's perspective