It was not intentional because he wasn't aware. But as I've also said just because he doesn't know being ignorant and all at the things she's been going through that he will be excused for his actions. I didn't say that he doesn't deserve the harsh treatment. I'm not excusing him for his wrongdoings. What I'm saying is that he made a big mistake ignoring her all those years even though he had the choice to get to know her. They were both young when they got engaged and lived together and he thought that she was being treated fairly on the duchy which is not. Neveah was neglected, she was lonely. He has the time but he chose to not know just because it's an arranged marriage but it's not his intention for her to experience such things. Nevertheless, we can still hurt someone even if we don't have the intention to do so. That's why I also said that my heart goes to Neveah for choosing to annul the engagement because she deserves to be happy.
I understand that you want him to suffer, I also do on the first few chapters. After reading it further, Valer being ignorant of all those years is much better compared to other novels I've read with a total shit whore fiance's who find other women or physically/verbally abuse the FL some even end up killing them which I hate the most. That's why I've also said in my first sentence that I'm glad he's not the latter because I thought he was. (Do not misunderstand. I don't like both I'm just evaluating it based on experience on my other readings.)
To conclude, am I excusing Valer for his actions? No. He deserves it. Again, ignorance is bliss but it's not an excuse. I just have my sentiments for him because of what I've thought but him caring for Neveah after all those years is way too late. Seriously way too late. The damage is done and now she's ready to move on.
I don't have to explain this to you because it's a matter of my opinion and my side of understanding the story. But since you've purposely called for my attention that's why I'm responding to you. If you don't agree with me then that's fine. I'm not posting comments to have disagreements and have you tagging me for your own opinion.
So let's just chill and look forward to the development of the story. Cause I'm seriously looking forward to seeing Neveah happy and in love with the Crown Prince with another cliche of let's not fall in love with each other bs but still falling head over heels on one another! I hope that the story will develop in a more mature setting (not an 18+ but on the character's development) but this is a shoujo manga so we'll still probably get the standard cliches and I'm still here for it. Peace.