Thanks for the chapter.
Yeah im really not a fan of the mc being labeled as a hardcore pervert for the actions of other people and its looking like that misunderstandig wont be cleared up anytime soon.
It also seems like that was maybe intentional on the side of the childhood friend. If shes willing to stop his love letter from getting to its intended target(which is what the teaser is implying), theres no guarantee she wont sabotage his love life in other ways as well. Maybe im overthinking it but that apology screams manipulative to me("Oh im soooo sorry now youre gonna be hated by your crush.

").
All in all, i feel bad for the mc.