“Jones” is an American slang word meaning to be addicted to something, so “jonesing” for something means to crave something very strongly, and generally very vocally.
“Breve” is a coffee drink that is commonly made with half-and-half, which is a product that is equal parts cream and milk. I assume that people have taken to using the term to refer to half-and-half itself, but I’ve not personally heard that.
So the sentence is saying that their cat was addicted to half-and-half and would act like a junkie doing anything to get their next fix.
He was a 19 year old man in the Netherlands talking to a 12 year old child in the United Kingdom on Facebook. He traveled to see her in the UK, got her drunk, raped her, and then attempted to get a hotel room with her. They couldn’t, so they slept under a stairwell and he raped her twice the next day. She had told him at one point that he was hurting her, but that didn’t stop him. After that, he flew back to the Netherlands and told her to go to a clinic for contraception.
So they were essentially strangers to each other with a significant age gap. I don’t know what her exact intentions were when speaking with him, but she was 12. Even if she were thinking about sex, it would not have been with an understanding of what that actually meant. She wasn’t just under age, she was well under the legal age of consent. There’s a reason that children cannot legally consent to sex.
Also, he’s never really shown any remorse for his actions. At best, he’s said that it was the biggest mistake of his life, but his overall stance seems to be that he regrets getting caught rather than raping a child. He’s much more angry at people calling him a pedophile than he is at himself for doing wrong. So your final points may be true, but they aren’t really relevant to his case because it doesn’t appear that he could be considered rehabilitated. He’s merely completed a prison sentence which was made lighter by Dutch law not classifying his actions as rape at the time.