<human>: Can you give me the gist of the text in a nutshell?

I posted another post the other day which I deleted before I could save the text. But I will explain things in here again. 

I seriously thought we could find a way through this. I had become emotional and upset when I witnessed what I considered to be harsh and unfair treatment of his 16yr old Aspergers stepdaughter. He withheld sweets from her while giving them to his other children, then repeatedly called her a bitch for becoming upset. 

When I tried to be diplomatic he was so offended he called the whole relationship off, but not before repeatedly defending his actions as "good parenting". I told him I found his treatment of her "unnecessarily cruel" which is what *really* upset him. I am stunned and cannot understand how he can just be so cold and harsh after our one and only disagreement. He said I made a "judgment call" and that he was "not ever going to lose this anger", and also that I had "poisoned the well" now and that basically that was that. We had been through an awful lot over this past year, and he said he loved me more than anyone else he had ever known. He said my actions here were unjustified and bullshit. 

I said I loved him and couldn't we at least discuss this together. He is being unbelievably cold and flat out said "No never, there's nothing to discuss, it's over you crossed the line by calling me a cruel parent to my daughter and that's the end of it." I feel so lost and confused, and like I did something wrong..when all I tried to do was explain honestly that I was deeply upset by the way he spoke to, and treated his obviously upset daughter. I even tried to soften it by suggesting that we work together to find solutions to deal with her and his relationship. 

But now I feel as though I have lost everything and I feel so sad and heartbroken.
<bot>: I told my partner of one year that I disproved of his cruel treatment towards his Asperger's stepdaughter, and he dumped me as a result.