Also, Rosie isn't your girlfriend when the game starts. She is a girl crushing on you. You have the opportunity to date her, but just how much "romance" is in that equation is for the player to decide.
It's almost quaint that you think making a "study date" at some girl's house means that you are just two steps from walking down the aisle together.
Beyond that, let's play pretend for a minute. Let's pretend that the dev said, "Here is Rosie. She has been the MC's love interest since they were both 8 years old." Why would YOU form an emotional bond? At that point in time, Rosie has had no opportunity to demonstrate anything more than she has large breasts. You don't know her personality, her intelligence, her morality, or her politics. Other than "cartoon tits! YAY!!!" you have no actual reason to want ANYTHING more than sticking your dick in her on a primal level.
Yet you straight up accuse another person as a sociopath simply because they aren't as quick as you to surrender their entire identity in order to seem appealing to a woman. In reality, you don't have the mental fortitude to operate in a live fire drill.
I'll tell you what your EXACT problem actually is, and here we go:
You booted this game, and JUMPED on the chance to date Rosie salivating at those big titties (me too). Then, you got the chance to cockblock Steve, and jumped on that (me too). Then you got that blowjob from Elise (me too), and shit blew up in your face.
You had expected this game to be just another harem game where every slut is yours, every wish is immediately granted, there is never any drama at any time, the end of the game can be predicted before even reading the title. But whatever else happens NEVER...ANY...CONSEQUENCES for anything that you do.
So, when you had to see the shocked look on Rosie's face after Elise told her what happened, you had to face the consequences of YOUR actions. This is the point where our experiences diverged. You thought "Oh, no! What hell hath I wrought? If the Twitch THOTs are to believed, I have just earned every woman on Earth a raping"
Whereas I thought, "This game is actually interesting. Fuck me, why was it 4 miles down the page when that trash fire 'Cosy Cafe' is constantly at the top?"
Finally, just because someone isn't as emotionally fragile as you, that doesn't mark them as a sociopath. It's far more likely that you simply ran into someone that isn't as invested in being a simp as are you. Simps get mocked, ridiculed, and laughed at. Mostly by those sluts to whom they keep sending their money.
Me? I'm a sociopath, a psychopath, and ASPD. I'm the man every woman fears. You're the child that every woman mocks. It's a thousand times better to be feared than mocked.
Those Twitch THOTs that you so obviously worship take your donations, hand them over to men like me, and get fucked stupid off of your continued virginity.
Toughen up, young one; Life is short, but it's WAY longer than you realize!!!