The manga fell quick from it orignal premise of "i think the guy who confessed to me must be lying to me" and I'm fine with this.
Become harem queen my girl
That is a failing of most harem manga. They never let other guys have love interest even when the girls couldn't reasonably be with the MC.
More manga should be like Monster Secret where they start pairing up the other girls with other guys once the main characters actually get together.
He was following her for a while now. He only saw her face for the first time literally at the end of this chapter after he was already following every new account she created.