This is a hyper dramatic premise to say the least.
I can believe that a woman would be sociopathic enough to sacrifice a guy's reputation just so she could get with another guy.
I can't believe so easily that the other guy would instantly believe her over his friend of 2 years, but maybe he and the woman have known each other for longer? Fine.
But then there's the rich guy. I get having a distaste for someone, but punishing his whole family for it is overkill. And wouldn't he at least feel sorry and try to make amends upon learning that his act caused a chain of events that killed the MC's family? Like, at all? Like, even if you believe the MC is this horrible pervert, that's not worth killing his whole family over... Right?
And then there's a bunch of assholes at the beginning being like, "Ha ha, his whole family is dead. Jump! Jump!" Maybe that could just be the MC hallucinating in his final moments. Normal people don't act like that. If those were real people saying real things, I'm honestly surprised that it only ended up being a suicide.