Maybe, rn she didnt cheat, but in the original she did, its mean she can cheat anytime.She didn't have a single romantic feeling for her childhood friend nor does she have a relationship with him at this point in the story aka she's not a "cheating whore". Calm your tits, you sound hysteric.
The fact that you decide to read manga with an ntr title on it and yet you get triggered so easily by it really speak volumes.
Go outside, touch grass. Enjoy the sun, call your therapist, whatever.
I read it because i thought it could be good because in the synopsis the mc was described as "hating ntr", then i though maybe, just maybe, its could be good if he destroyed all the ntr.
I touch enough grass, i dont need an therapist, so please just shut up and go jerk off to your stupid and gross ntr you love some much