But did directly confessed to kotarou or was it a inner monologue moment
Spoiler for Answer:
It was somewhat of a direct confession, although the narrator makes sure to inform us that the reason she phrased it that way was because she was afraid a direct confession could be rejected in just as direct a manner. Consequently, she termed it "invading his life" because that phrasing wouldn't allow for a rejection. That said, Koutarou was quite clear what she meant, and even though this occurs post-time skip, he still finds it hard to be explicitly honest about how much he likes her, so it worked out for him as well.
"Tomorrow’s illiterate will not be the man who can’t read; he will be the man who has not learned how to learn." - Herbert Gerjuoy