Ok, hot take... That Kondo guy who his friend cheated with... before MC server sided himself, he should die.
Instant violence - strike 1
Being insanely vile and vitriol about his "gf" - strike 2
Possible source of life ruining rumors - strike 3
Going for his family - STRIKE 4
At that point, it is your biggest, most antagonistic, cancer-class enemy. You'd do the world a favor for getting rid of it.
(edit)Honestly... I'm going back and rating it as 1
The comeback into new gf, very nice adult's, understanding teachers, fucking gigachad mom, it's good and all... but the author chose to fucking torture the reader with over the top, excessive, and STILL IN THE STORY, pos "im going to be the worst creature imaginable ever" villain. You can remake this story anew and do it right, without making readers scroll the chapter with the their fist clenched and shaking from anger. And the childhoodfriend is no fucking better, I'm traumatized by the low IQ "how could this happen to me!" tragedy heroines who cheat, get fucked on drugs, lose their mind (literally AND figuratively), just because the author knows subtlety. And ultimately, there's only pity for them, because these authors write them to be so absolutely dumb that there's only 1 person to blame for putting a hardly pubescent actual idiot in a horrid situation like this, god, the maker of this world, the damned author.