tbh if your family got killed and then you were sold as a slave... Penelope didn't get him everything he wants. Eclis needed freedom. She bought him and used him. He ignored and forgot about him for days, kept him exactly like a dog. She just used him. And he did too and I think that's fair. He lost everything and got mad. Everyone would.
what did he lost and who is he mad at? Was that Penelope's fault? Nope. He was the one who betrayed Penelope so he can monopolize her.
But as i stated above, i am Penelope's apologist. Even if you have the soundest argument why eclis should receive sympathy and whatever, i would not hear it because i would not do that to my girly pop penelope. I fear that she is the best in my eyes and she can do whatever she wants because she can 乁 ˘ o ˘ ㄏ ~(つˆДˆ)つ。☆ she could kill someone and she would still looks like this to me (◕ᴗ◕✿)

Tbh when i first read the novel, i held a bit of sympathy for eclis because he was used right? But once I reread the novel, I'm all for Penelope's actions. It's not like Eclis was exploited or smth. Penelope gave him everything for Eclis and just wanted one thing and this is the thanks he gave? Nuh uh.
I am absolutely Penelope's apologist. No one can make me hate her.